Type of site
|Web search engine|
|Available in||149 languages|
|Owner||Google LLC (subsidiary of Alphabet Inc.)|
|Alexa rank||1 (May 2018[update])|
|Users||4.5+ billion monthly active users|
|Launched||September 15, 1997|
|Written in||Python, C, C++|
Google Search, also referred to as Google Web Search or simply Google, is a web search engine developed by Google LLC. It is the most-used search engine on the World Wide Web, handling more than three billion searches each day. As of July 2018[update], it is the most used search engine worldwide across all platforms with 90.46% market share.
The order of search results returned by Google is based, in part, on a priority rank system called "PageRank". Google Search also provides many different options for customized search, using symbols to include, exclude, specify or require certain search behavior, and offers specialized interactive experiences, such as flight status and package tracking, weather forecasts, currency, unit and time conversions, word definitions, and more.
The main purpose of Google Search is to hunt for text in publicly accessible documents offered by web servers, as opposed to other data, such as images or data contained in databases. It was originally developed by Larry Page and Sergey Brin in 1997. In June 2011 Google introduced "Google Voice Search" to search for spoken, rather than typed, words. In May 2012 Google introduced a Knowledge Graph semantic search feature in the U.S.
Analysis of the frequency of search terms may indicate economic, social and health trends. Data about the frequency of use of search terms on Google can be openly inquired via Google Trends and have been shown to correlate with flu outbreaks and unemployment levels, and provide the information faster than traditional reporting methods and surveys. As of mid-2016, Google’s search engine has begun to rely on deep neural networks.
Competitors of Google include Baidu and Soso.com in China; Naver.com and Daum.net in South Korea; Yandex in Russia; Seznam.cz in the Czech Republic; Yahoo in Japan, Taiwan and the US, as well as Bing and DuckDuckGo. Some smaller search engines offer facilities not available with Google, e.g. not storing any private or tracking information.
- 1 PageRank
- 2 Search indexing
- 3 Functionality
- 3.1 Search syntax
- 3.2 "I'm Feeling Lucky"
- 3.3 Rich snippets
- 3.4 Special interactive features
- 3.5 Google Doodles
- 3.6 "OK Google" conversational search
- 3.7 Personal tab
- 3.8 Google for Jobs
- 3.9 Google feed
- 3.10 Discontinued features
- 4 Criticism
- 5 Redesign
- 6 Smartphone apps
- 7 International availability
- 8 Search products
- 9 Energy consumption
- 10 Possible misuse of search results
- 11 Predicting behavior
- 12 See also
- 13 References
- 14 Further reading
- 15 External links
Google's rise to success was largely due to a patented algorithm called PageRank that helps rank web pages that match a given search string. When Google was a Stanford research project, it was nicknamed BackRub because the technology checks backlinks to determine a site's importance. Previous keyword-based methods of ranking search results, used by many search engines that were once more popular than Google, would rank pages by how often the search terms occurred in the page, or how strongly associated the search terms were within each resulting page. The PageRank algorithm instead analyzes human-generated links assuming that web pages linked from many important pages are themselves likely to be important. The algorithm computes a recursive score for pages, based on the weighted sum of the PageRanks of the pages linking to them. PageRank is thought to correlate well with human concepts of importance. In addition to PageRank, Google, over the years, has added many other secret criteria for determining the ranking of pages on result lists, reported to be over 250 different indicators, the specifics of which are kept secret to keep spammers at bay and help Google maintain an edge over its competitors globally.
In a potential hint of Google's future direction for their Search algorithm, Eric Schmidt, Google's then chief executive, said in a 2007 interview with the Financial Times: "The goal is to enable Google users to be able to ask the question such as 'What shall I do tomorrow?' and 'What job shall I take?'". Schmidt reaffirmed this during a 2010 interview with the Wall Street Journal: "I actually think most people don't want Google to answer their questions, they want Google to tell them what they should be doing next."
In 2013 the European Commission found that Google Search favored Google's own products, instead of offering consumers the best result for their needs. In February 2015 Google announced a major change to its mobile search algorithm which would favor mobile friendly over other websites. Nearly 60% of Google's online search traffic comes from mobile phones. Google says it wants its users to have access to premium quality websites. Those websites which lack a mobile friendly interface would be demoted and it is expected that this update will cause a shake-up of ranks. Businesses who fail to update their websites accordingly could see a dip in their regular websites traffic.
Google indexes hundreds of terabytes of information from web pages. For websites that are currently down or otherwise not available, Google provides links to cached versions of the site, formed by the search engine's latest indexing of that page. Additionally, Google indexes some file types, being able to show users PDFs, Word documents, Excel spreadsheets, PowerPoint presentations, certain Flash multimedia content, and plain text files. Users can also activate "SafeSearch", a filtering technology aimed at preventing explicit and pornographic content from appearing in search results.
In 2012, Google changed its search indexing tools to demote sites that had been accused of piracy.
Despite Google search's immense index, sources generally assume that Google is only indexing less than 5% of the total Internet, with the rest belonging to the deep web, inaccessible through its search tools.
Because Google is the most popular search engine, many webmasters attempt to influence their website's Google rankings. An industry of consultants has arisen to help websites increase their rankings on Google and on other search engines. This field, called search engine optimization, attempts to discern patterns in search engine listings, and then develop a methodology for improving rankings to draw more searchers to their clients' sites. Search engine optimization encompasses both "on page" factors (like body copy, title elements, H1 heading elements and image alt attribute values) and Off Page Optimization factors (like anchor text and PageRank). The general idea is to affect Google's relevance algorithm by incorporating the keywords being targeted in various places "on page", in particular the title element and the body copy (note: the higher up in the page, presumably the better its keyword prominence and thus the ranking). Too many occurrences of the keyword, however, cause the page to look suspect to Google's spam checking algorithms. Google has published guidelines for website owners who would like to raise their rankings when using legitimate optimization consultants. It has been hypothesized, and, allegedly, is the opinion of the owner of one business about which there have been numerous complaints, that negative publicity, for example, numerous consumer complaints, may serve as well to elevate page rank on Google Search as favorable comments. The particular problem addressed in The New York Times article, which involved DecorMyEyes, was addressed shortly thereafter by an undisclosed fix in the Google algorithm. According to Google, it was not the frequently published consumer complaints about DecorMyEyes which resulted in the high ranking but mentions on news websites of events which affected the firm such as legal actions against it. Google Search Console helps to check for websites that use duplicate or copyright content.
"Universal search" was launched by Google on May 16, 2007 as an idea that merged the results from different kinds of search types into one. Prior to Universal search, a standard Google search would consist of links only to websites. Universal search, however, incorporates a wide variety of sources, including websites, news, pictures, maps, blogs, videos, and more, all shown on the same search results page. Marissa Mayer, then-vice president of search products and user experience, described the goal of Universal search as "we're attempting to break down the walls that traditionally separated our various search properties and integrate the vast amounts of information available into one simple set of search results.
"Caffeine" search architecture upgrade
In August 2009, Google invited web developers to test a new search architecture, codenamed "Caffeine", and give their feedback. The new architecture provided no visual differences in the user interface, but added significant speed improvements and a new "under-the-hood" indexing infrastructure. The move was interpreted in some quarters as a response to Microsoft's recent release of an upgraded version of its own search service, renamed Bing, as well as the launch of Wolfram Alpha, a new search engine based on "computational knowledge". Google announced completion of "Caffeine" on June 8, 2010, claiming 50% fresher results due to continuous updating of its index.
The Knowledge Graph is a knowledge base used by Google to enhance its search engine's results with information gathered from a variety of sources. This information is presented to users in a box to the right of search results. Knowledge Graph boxes were added to Google's search engine in May 2012, starting in the United States, with international expansion by the end of the year. The information covered by the Knowledge Graph grew significantly after launch, tripling its original size within seven months, and being able to answer "roughly one-third" of the 100 billion monthly searches Google processed in May 2016. The information is often used as a spoken answer in Google Assistant and Google Home searches. The Knowledge Graph has been criticized for providing answers without source attribution.
"Hummingbird" search algorithm upgrade
In 2013, Google significantly upgraded its search algorithm with "Hummingbird". Its name was derived from the speed and accuracy of the hummingbird. The change was announced on September 26, 2013, having already been in use for a month. "Hummingbird" places greater emphasis on natural language queries, considering context and meaning over individual keywords. It also looks deeper at content on individual pages of a website, with improved ability to lead users directly to the most appropriate page rather than just a website's homepage. The upgrade marked the most significant change to Google search in years, with more "human" search interactions and a much heavier focus on conversation and meaning. Thus, web developers and writers were encouraged to optimize their sites with natural writing rather than forced keywords, and make effective use of technical web development for on-site navigation.
Dedicated mobile search results
In October 2016, Gary Illyes, a webmaster trends analyst with Google, announced that the search engine would be making a separate, primary web index dedicated for mobile devices, with a secondary, less up-to-date index for desktop use. The change was a response to the continued growth in mobile usage, and a push for web developers to adopt a mobile-friendly version of their websites. In December 2017, Google began rolling out the change, having already done so for a few websites.
Google search consists of a series of localized websites. The largest of those, the google.com site, is the top most-visited website in the world. Some of its features include a definition link for most searches including dictionary words, the number of results you got on your search, links to other searches (e.g. for words that Google believes to be misspelled, it provides a link to the search results using its proposed spelling), and many more.
Google search accepts queries as normal text, as well as individual keywords. It automatically corrects misspelled words, and yields the same results regardless of capitalization. For more customized results, one can use a wide variety of operators, including, but not limited to:
OR– Search for webpages containing one of two similar queries, such as marathon OR race
-(minus sign) – Exclude a word or a phrase, such as "apple -tree" searches where word "tree" is not used
""– Force inclusion of a word or a phrase, such as "tallest building"
*– Placeholder symbol allowing for any substitute words in the context of the query, such as "largest * in the world"
..– Search within a range of numbers, such as "camera $50..$100"
site:- Search within a specific website, such as "site:youtube.com"
define:– See a definition of a word, such as "define:phrase"
stocks:– See the stock price of investments, such as "stocks:googl"
related:- Find webpages related to specific URL addresses, such as "related:www.wikipedia.org"
cache:– Highlights the search-words within the cached pages, such as "cache:www.google.com xxx" shows cached content with word "xxx" highlighted.
@- Search for a specific word on social media networks, such as "@twitter"
Google applies query expansion to submitted search queries, using techniques to deliver results that it considers "smarter" than the query users actually submitted. This technique involves several steps, including:
- Word stemming - Certain words can be reduced so other, similar terms, are also found in results, such as "translator" can also search for "translation"
- Acronyms - Searching for abbreviations can also return results about the name in its full length, such as "NATO" can show results for "North Atlantic Treaty Organization"
- Misspellings - Google will often suggest correct spellings for misspelled words
- Synonyms - In most cases where a word is incorrectly used in a phrase or sentence, Google search will show results based on the correct synonym
- Translations - The search engine can, in some instances, suggest results for specific words in a different language
- Ignoring words - In some search queries containing extraneous or insignificant words, Google search will simply drop those specific words from the query
"I'm Feeling Lucky"
Google's homepage includes a button labeled "I'm Feeling Lucky". This feature originally allowed users to type in their search query, click the button and be taken directly to the first result, bypassing the search results page. With the 2010 announcement of Google Instant, an automatic feature that immediately displays relevant results as users are typing in their query, the "I'm Feeling Lucky" button disappears, requiring that users opt-out of Instant results through search settings in order to keep using the "I'm Feeling Lucky" functionality. In 2012, "I'm Feeling Lucky" was changed to serve as an advertisement for Google services; users hover their computer mouse over the button, it spins and shows an emotion ("I'm Feeling Puzzled" or "I'm Feeling Trendy", for instance), and, when clicked, takes users to a Google service related to that emotion.
Tom Chavez of "Rapt", a firm helping to determine a website's advertising worth, estimated in 2007 that Google lost $110 million in revenue per year due to use of the button, which bypasses the advertisements found on the search results page.
In May 2009, Google announced that they would be parsing website microformats in order to populate search result pages with "Rich snippets". Such snippets include additional details about results, such as displaying reviews for restaurants and social media accounts for individuals.
In May 2016, Google expanded on the "Rich snippets" format to offer "Rich cards", which, similarly to snippets, display more information about results, but shows them at the top of the mobile website in a swipeable carousel-like format. Originally limited to movie and recipe websites in the United States only, the feature expanded to all countries globally in 2017.
Special interactive features
- Time zone, currency, and unit conversions
- Word translations
- Flight status
- Local film showings
- Weather forecasts
- Population and unemployment rates
- Package tracking
- Word definitions
- "Do a barrel roll" (search page spins)
- "askew" (results show up sideways)
On certain occasions, the logo on Google's webpage will change to a special version, known as a "Google Doodle". This is a picture, drawing, animation or interactive game that includes the logo. It is usually done for a special event or day although not all of them are well known. Clicking on the Doodle links to a string of Google search results about the topic. The first was a reference to the Burning Man Festival in 1998, and others have been produced for the birthdays of notable people like Albert Einstein, historical events like the interlocking Lego block's 50th anniversary and holidays like Valentine's Day. Some Google Doodles have interactivity beyond a simple search, such as the famous "Google Pacman" version that appeared on May 21, 2010.
"OK Google" conversational search
During Google's developer conference in May 2013, the company announced that, on Google Chrome and Chrome OS, users would be able to say "OK Google", with the browser initiating an audio-based search, with no button presses required. After having the answer presented, users can follow up with additional, contextual questions; an example include initially asking "OK Google, will it be sunny in Santa Cruz this weekend?", hearing a spoken answer, and reply with "how far is it from here?" An update to the Chrome browser with voice-search functionality rolled out a week later, though it required a button press on a microphone icon rather than "OK Google" voice activation. Google released a browser extension for the Chrome browser, named with a "beta" tag for unfinished development, shortly thereafter. In May 2014, the company officially added "OK Google" into the browser itself, though the company removed it in October 2015, citing low usage, though the microphone icon for activation remained available. In May 2016, 20% of search queries on mobile devices were done through voice.
In May 2017, Google enabled a new "Personal" tab in Google Search, letting users search for content in their Google accounts' various services, including email messages from Gmail and photos from Google Photos.
Google for Jobs
In June 2017, Google expanded its search results to cover available job listings. The data is aggregated from various major job boards and collected by analyzing company homepages. Initially only available in English, the feature aims to simplify finding jobs suitable for each user.
The Google feed is a personalized stream of articles, videos, and other news-related content. The feed contains a "mix of cards" which show topics of interest based on users' interactions with Google, or topics they choose to follow directly. Cards include, "links to news stories, YouTube videos, sports scores, recipes, and other content based on what [Google] determined you're most likely to be interested in at that particular moment." Users can also tell Google they're not interested in certain topics to avoid seeing future updates.
The Google feed launched in December 2016 and received a major update in July 2017. As of May 2018, the Google feed can be found on the Google app and by swiping left on the home screen of certain Android devices.
Translate foreign pages
Until May 2013, Google Search had offered a feature to restrict search results to specific languages. A Google spokesperson told Search Engine Land that "Removing features is always tough, but we do think very hard about each decision and its implications for our users. Unfortunately, this feature never saw much pick up".
Instant search was announced in September 2010 as a feature that displayed suggested results while the user typed in their search query. The primary advantage of the new system was its ability to save time, with Marissa Mayer, then-vice president of search products and user experience, proclaiming that the feature would save 2-5 seconds per search, elaborating that "That may not seem like a lot at first, but it adds up. With Google Instant, we estimate that we’ll save our users 11 hours with each passing second!" Matt Van Wagner of Search Engine Land wrote that "Personally, I kind of like Google Instant and I think it represents a natural evolution in the way search works", and also praised Google's efforts in public relations, writing that "With just a press conference and a few well-placed interviews, Google has parlayed this relatively minor speed improvement into an attention-grabbing front-page news story". The upgrade also became notable for the company switching Google Search's underlying technology from HTML to AJAX.
Instant Search could be disabled via Google's "preferences" menu for those who didn't want its functionality.
There are a number of reasons you may not be seeing search queries for a particular topic. Among other things, we apply a narrow set of removal policies for pornography, violence, and hate speech. It's important to note that removing queries from Autocomplete is a hard problem, and not as simple as blacklisting particular terms and phrases.
In search, we get more than one billion searches each day. Because of this, we take an algorithmic approach to removals, and just like our search algorithms, these are imperfect. We will continue to work to improve our approach to removals in Autocomplete, and are listening carefully to feedback from our users.
Our algorithms look not only at specific words, but compound queries based on those words, and across all languages. So, for example, if there's a bad word in Russian, we may remove a compound word including the transliteration of the Russian word into English. We also look at the search results themselves for given queries. So, for example, if the results for a particular query seem pornographic, our algorithms may remove that query from Autocomplete, even if the query itself wouldn't otherwise violate our policies. This system is neither perfect nor instantaneous, and we will continue to work to make it better.
PC Magazine discussed the inconsistency in how some forms of the same topic are allowed; for instance, "lesbian" was blocked, while "gay" was not, and "cocaine" was blocked, while "crack" and "heroin" were not. The report further stated that seemingly normal words were also blocked due to pornographic innuendos, most notably "scat", likely due to having two completely separate contextual meanings, one for music and one for a sexual practice.
In July 2017, Google removed Instant results, due to a growing number of searches on mobile devices, where interaction with search, as well as screen sizes, differ significantly from a computer.
Dedicated encrypted search page
Various search engines provide encrypted Web search facilities. In May 2010 Google rolled out SSL-encrypted web search. The encrypted search can be accessed at
encrypted.google.com However, the web search is encrypted via Transport Layer Security (TLS) by default today, thus every search request should be automatically encrypted if TLS is supported by the web browser. On its support website, Google announced that the address
encrypted.google.com will be turned off in April 30 of 2018, stating that all Google products and most new browsers use HTTPS connections as the reason for the discontinuation.
January 2009 malware bug
Google flags search results with the message "This site may harm your computer" if the site is known to install malicious software in the background or otherwise surreptitiously. Google does this to protect users against visiting sites that could harm their computers. For approximately 40 minutes on January 31, 2009, all search results were mistakenly classified as malware and could therefore not be clicked; instead a warning message was displayed and the user was required to enter the requested URL manually. The bug was caused by human error. The URL of "/" (which expands to all URLs) was mistakenly added to the malware patterns file.
This section needs expansion. You can help by adding to it. (March 2012)
Searches made by search engines, including Google, leave traces. This raises concerns about privacy. In principle, if details of a user's searches are found, those with access to the information—principally state agencies responsible for law enforcement and similar matters—can make deductions about the user's activities. This has been used for the detection and prosecution of lawbreakers; for example a murderer was found and convicted after searching for terms such as "tips with killing with a baseball bat".
A search may leave traces both on a computer used to make the search, and in records kept by the search provider. When using a search engine through a browser program on a computer, search terms and other information may be stored on the computer by default, unless the browser is set not to do this, or they are erased. Saved terms may be discovered on forensic analysis of the computer. An Internet Service Provider (ISP) or search engine provider (e.g., Google) may store records which relate search terms to an IP address and a time. Whether such logs are kept, and access to them by law enforcement agencies, is subject to legislation in different jurisdictions and working practices; the law may mandate, prohibit, or say nothing about logging of various types of information. Some search engines, located in jurisdictions where it is not illegal, make a feature of not storing user search information.
The keywords suggested by the Autocomplete feature show a population of users' research which is made possible by an identity management system. Volumes of personal data are collected via Eddystone web and proximity beacons.
Google has been criticized for placing long-term cookies on users' machines to store these preferences, a tactic which also enables them to track a user's search terms and retain the data for more than a year.
Since 2012, Google Inc. has globally introduced encrypted connections for most of its clients, in order to bypass governative blockings of the commercial and IT services.
In 2012 the US Federal Trade Commission fined Google US$22.5 million for violating their agreement not to violate the privacy of users of the Apple Safari (web browser). The FTC was also continuing to investigate if Google's favoring of their own services in their search results violated antitrust regulations.
This section needs expansion. You can help by adding to it. (January 2016)
This section needs to be updated.(January 2016)
In late June 2011, Google introduced a new look to the Google home page in order to boost the use of the Google+ social tools.
One of the major changes was replacing the classic navigation bar with a black one. Google's digital creative director Chris Wiggins explains: "We're working on a project to bring you a new and improved Google experience, and over the next few months, you'll continue to see more updates to our look and feel." The new navigation bar has been negatively received by a vocal minority.
In November 2013, Google started testing yellow labels for advertisements displayed in search results, to improve user experience. The new labels, highlighted in yellow color, and aligned to the left of each sponsored link help users clearly differentiate between organic and sponsored results.
On December 15, 2016, Google rolled out a new desktop search interface that mimics their modular mobile user interface. The mobile design consists of a tabular design that highlights search features in boxes. and works by imitating the desktop Knowledge Graph real estate, which appears in the right-hand rail of the search engine result page, these featured elements frequently feature Twitter carousels, People Also Search For, and Top Stories (vertical and horizontal design) modules. The Local Pack and Answer Box were two of the original features of the Google SERP that were primarily showcased in this manner, but this new layout creates a previously unseen level of design consistency for Google results.
Google offers a "Google Search" mobile app for Android and iOS devices. The mobile apps exclusively feature a "feed", a news feed-style page of continually-updated developments on news and topics of interest to individual users. Android devices were introduced to a preview of the feed in December 2016, while it was made official on both Android and iOS in July 2017.
In April 2016, Google updated its Search app on Android to feature "Trends"; search queries gaining popularity appeared in the autocomplete box along with normal query autocompletion. The update received significant backlash, due to encouraging search queries unrelated to users' interests or intentions, prompting the company to issue an update with an opt-out option. In September 2017, the Google Search app on iOS was updated to feature the same functionality.
Google is available in many languages and has been localized completely or partially for many countries, including separate regional domain names.
One-minute domain availability issue
On September 29, 2015, an ex-employee of Google, Sanmay Ved, managed to buy the domain Google.com via Google's domain registration service and gained full webmaster control. His access was shut down one minute later. He told Business Insider that "I used to work at Google so I keep messing around with the product. I type in Google.com and to my surprise it showed it as available. ... I thought it was some error, but I could actually complete check out". The cost for the domain was $12. In compensation for finding the security vulnerability, Google offered him $6,000. After Ved explained that he wanted to give the money to charity, Google doubled the amount to $12,000.
In addition to its tool for searching webpages, Google also provides services for searching images, Usenet newsgroups, news websites, videos, searching by locality, maps, and items for sale online. In 2012, Google has indexed over 30 trillion web pages, and received 100 billion queries per month. It also caches much of the content that it indexes. Google operates other tools and services including Google News, Google Shopping, Google Maps, Google Custom Search, Google Earth, Google Docs, Picasa, Panoramio, YouTube, Google Translate, Google Blog Search and Google Desktop Search.
There are also products available from Google that are not directly search-related. Gmail, for example, is a webmail application, but still includes search features; Google Browser Sync does not offer any search facilities, although it aims to organize your browsing time.
Also Google starts many new beta products, like Google Social Search or Google Image Swirl.
In 2009, Google claimed that a search query requires altogether about 1 kJ or 0.0003 kW·h, which is enough to raise the temperature of one liter of water by 0.24 °C. According to green search engine Ecosia, the industry standard for search engines is estimated to be about 0.2 grams of CO2 emission per search. Google's 40,000 searches per second translate to 8 kg CO2 per second or over 252 million kilos of CO2 per year.
Possible misuse of search results
In 2007, a group of researchers observed a tendency for users to rely on Google Search exclusively for finding information, writing that "With the Google interface the user gets the impression that the search results imply a kind of totality. [...] In fact, one only sees a small part of what one could see if one also integrates other research tools."
In 2011, Google Search query results have been shown to be tailored to users by Internet activist Eli Pariser, effectively isolating users in what he defined as a filter bubble. Pariser holds algorithms used in search engines such as Google Search responsible for catering "a personal ecosystem of information". Although contrasting views have mitigated the potential threat of "informational dystopia" and questioned the scientific nature of Pariser's claims, filter bubbles have been mentioned to account for the surprising results of the U.S. presidential election in 2016 alongside fake news and echo chambers, suggesting that Facebook and Google have designed personalized online realities in which « we only see and hear what we like » .
At the 2016 New Hampshire primary, the top-searched Democratic candidate was Bernie Sanders with 72% of the searches and won with 60% of the vote, according to real-time results of Google's trending search queries, and Hillary Clinton received 28% of the queries and 38% of the vote. The top-searched Republican candidate was Donald Trump, who received 41% of the searches an hour before the polls closed and won with 35% of the vote and John Kasich got 16% of both the vote and the searches.
- Censorship by Google
- Google bomb
- Criticism of Google
- Filter bubble
- Google Panda
- Google Penguin
- Google Searchology
- Google (verb)
- History of Google
- List of Google products
- List of search engines
- Social graph
- Timeline of Google Search
- Comparison of web search engines
- "Google over IPv6". Retrieved December 8, 2010.
- "Google.com Site Info". Alexa Internet. Retrieved May 30, 2018.
- "WHOIS". Retrieved January 27, 2009.
- "The Anatomy of a Large-Scale Hypertextual Web Search Engine". Computer Science Department, Stanford University, Stanford, CA. Retrieved January 27, 2009.
- "Alexa Top Sites By Category – Search Engine Ranking". Retrieved May 16, 2013.
- "Google Search Statistics - Internet Live Stats". www.internetlivestats.com. Retrieved 2018-05-30.
- "Search Engine Market Share Worldwide | StatCounter Global Stats". StatCounter Global Stats. Retrieved 2018-07-25.
- Google (Tue June 14, 2011) Official announcement
- Hubbard, Douglas (2011). Pulse: The New Science of Harnessing Internet Buzz to Track Threats and Opportunities. John Wiley & Sons.
- "Soon We Won't Program Computers. We'll Train Them Like Dogs". WIRED. Retrieved 2018-05-30.
- "thetechbook » Countries where Google is not #1 search engine". Woolor.com. Archived from the original on January 1, 2013. Retrieved December 26, 2012.
- Brin, S.; Page, L. (1998). "The anatomy of a large-scale hypertextual Web search engine" (PDF). Computer Networks and ISDN Systems. 30: 107–117. doi:10.1016/S0169-7552(98)00110-X. ISSN 0169-7552.
- "Corporate Information: Technology Overview". Google. Retrieved November 15, 2009.
- Levy, Steven (February 22, 2010). "Exclusive: How Google's Algorithm Rules the Web". Wired.com. Archived from the original on April 16, 2011.
- Google's goal: to organize your daily life Financial Times
- Google and the Search for the Future Wall Street Journal
- Barker, Alex; McCarthy, Bede (April 9, 2013). "Google favours 'in-house' search results". www.ft.com. The Financial Times Ltd. Retrieved January 26, 2014.
- D'Onfro, Jillian (April 19, 2015). "Google is making a giant change this week that could crush millions of small businesses". Business Insider.
- Dominguez, Trace (September 2, 2015). "How Much of the Internet Is Hidden?". Seeker. Group Nine Media. Retrieved December 9, 2017.
- "View web pages cached in Google Search Results". Google Search Help. Google. Retrieved December 9, 2017.
- Boswell, Wendy (November 1, 2017). "How to Use Google to Find and Open Files Online". Lifewire. Dotdash. Retrieved December 9, 2017.
- "Block explicit results on Google using SafeSearch". Google Search Help. Google. Retrieved December 9, 2017.
- Albanesius, Chloe (August 10, 2012). "Google to Demote Sites With 'High Number' of Copyright Complaints". PC Magazine. Ziff Davis. Retrieved December 9, 2017.
- Rosen, JJ (May 3, 2014). "The Internet you can't Google". The Tennessean. Gannett Company. Retrieved December 9, 2017.
- Sherman, Chris; Price, Gary (May 22, 2008). "The Invisible Web: Uncovering Sources Search Engines Can't See". Illinois Digital Environment for Access to Learning and Scholarship. University of Illinois at Urbana–Champaign. hdl:2142/8528.
- "Google Webmaster Guidelines". Google. Retrieved November 15, 2009.
- Segal, David (November 26, 2010). "A Bully Finds a Pulpit on the Web". The New York Times. Retrieved November 27, 2010.
- "Blogspot.com". Googleblog.blogspot.com. Retrieved August 4, 2012.
- Marshall, Matt (May 16, 2007). "Google's move to "universal search"". VentureBeat. Retrieved December 9, 2017.
- Sullivan, Danny (May 16, 2007). "Google Launches "Universal Search" & Blended Results". Search Engine Land. Retrieved December 9, 2017.
- Mayer, Marissa (May 16, 2007). "Universal search: The best answer is still the best answer". Official Google Blog. Google. Retrieved December 9, 2017.
- Barnett, Emma (August 11, 2009). "Google reveals caffeine: a new faster search engine". The Daily Telegraph. Telegraph Media Group. Retrieved December 9, 2017.
- Fox, Vanessa (August 10, 2009). "Google Caffeine: Google's New Search Engine Index". Search Engine Land. Retrieved December 9, 2017.
- Fox, Vanessa (June 8, 2010). "Google's New Indexing Infrastructure "Caffeine" Now Live". Search Engine Land. Retrieved December 9, 2017.
- Metz, Cade (September 9, 2010). "Google search index splits with MapReduce". The Register. Situation Publishing. Retrieved December 9, 2017.
- Metz, Cade (August 14, 2009). "Google Caffeine: What it really is". The Register. Situation Publishing. Retrieved December 9, 2017.
- Singhal, Amit (May 16, 2012). "Introducing the Knowledge Graph: things, not strings". Official Google Blog. Google. Retrieved December 10, 2017.
- "Your business information in the Knowledge Panel". Google My Business Help. Google. Retrieved December 10, 2017.
- Newton, Casey (December 14, 2012). "How Google is taking the Knowledge Graph global". CNET. CBS Interactive. Retrieved December 10, 2017.
- Newton, Casey (December 4, 2012). "Google's Knowledge Graph tripled in size in seven months". CNET. CBS Interactive. Retrieved December 10, 2017.
- Dewey, Caitlin (May 11, 2016). "You probably haven't even noticed Google's sketchy quest to control the world's knowledge". The Washington Post. Retrieved December 10, 2017.
- Lynley, Matthew (May 18, 2016). "Google unveils Google Assistant, a virtual assistant that's a big upgrade to Google Now". TechCrunch. Oath Inc. Retrieved December 10, 2017.
- Bohn, Dieter (May 18, 2016). "Google Home: a speaker to finally take on the Amazon Echo". The Verge. Vox Media. Retrieved December 10, 2017.
- Elran, Asher (November 15, 2013). "What Google 'Hummingbird' Means for Your SEO Strategy". Entrepreneur. Retrieved December 10, 2017.
- Sullivan, Danny (September 26, 2013). "FAQ: All About The New Google "Hummingbird" Algorithm". Search Engine Land. Retrieved December 10, 2017.
- Dodds, Don (December 16, 2013). "An SEO Guide to the Google Hummingbird Update". HuffPost. Oath Inc. Retrieved December 10, 2017.
- Taylor, Richard (September 26, 2013). "Google unveils major upgrade to search algorithm". BBC News. BBC. Retrieved December 10, 2017.
- Marentis, Chris (April 11, 2014). "A Complete Guide To The Essentials Of Post-Hummingbird SEO". Search Engine Land. Retrieved December 10, 2017.
- Schwartz, Barry (October 13, 2016). "Within months, Google to divide its index, giving mobile users better & fresher content". Search Engine Land. Retrieved December 9, 2017.
- Roberts, Hannah (October 27, 2016). "Google is splitting its search index to target 'stripped down' mobile websites". Business Insider. Axel Springer SE. Retrieved December 9, 2017.
- Perez, Sarah (December 20, 2017). "Google's mobile-first search index has rolled out to a handful of sites". TechCrunch. Oath Inc. Retrieved December 21, 2017.
- "Top 500". Alexa. Retrieved April 15, 2008.
- "How to search on Google". Google Search Help. Google. Retrieved December 9, 2017.
- "Refine web searches". Google Search Help. Google. Retrieved December 9, 2017.
- Boswell, Wendy (October 5, 2017). "Advanced Google Search Shortcuts". Lifewire. Dotdash. Retrieved December 9, 2017.
- Smarty, Ann (October 31, 2008). "What is Google Query Expansion? Cases and Examples". Search Engine Journal. Retrieved December 9, 2017.
- Sullivan, Danny (August 25, 2008). "Google.com Finally Gets Google Suggest Feature". Search Engine Land. Retrieved December 9, 2017.
- Karch, Marziah (November 25, 2017). "How to Use Google's "I'm Feeling Lucky" Button". Lifewire. Dotdash. Retrieved December 9, 2017.
- Paul, Ian (August 24, 2012). "Google Changes 'I'm Feeling Lucky' Button". PC World. International Data Group. Retrieved December 9, 2017.
- Newman, Brendan (November 19, 2007). "Are you feeling lucky? Google is". Marketplace. American Public Media. Retrieved December 9, 2017.
- Fox, Vanessa (May 12, 2009). "Google Search Now Supports Microformats and Adds "Rich Snippets" to Search Results". Search Engine Land. Retrieved December 9, 2017.
- Schwartz, Barry (May 17, 2016). "Google launches rich cards for movie and recipe websites". Search Engine Land. Retrieved December 9, 2017.
- Schwartz, Barry (March 29, 2017). "Google quietly expands rich cards worldwide". Search Engine Land. Retrieved December 9, 2017.
- "15 fun Google Easter eggs". The Daily Telegraph. Telegraph Media Group. August 17, 2017. Retrieved December 9, 2017.
- Klosowski, Thorin (September 6, 2012). "20 Google Search Shortcuts to Hone Your Google-Fu". Lifehacker. Univision Communications. Retrieved December 9, 2017.
- Graziano, Dan (August 9, 2013). "How to get the most out of Google search". CNET. CBS Interactive. Retrieved December 9, 2017.
- About Google Doodles. Google.com. Retrieved on November 29, 2013.
- Hwang, Dennis (June 8, 2004). "Oodles of Doodles". Google (corporate blog). Retrieved July 19, 2006.
- "Doodle History". Google, Inc. Retrieved October 5, 2010.
- "Google logos:Valentine's Day logo". February 14, 2007. Retrieved April 6, 2007.
- Warman, Matt (May 16, 2013). "'OK Google' - 'conversational search' is coming soon". The Daily Telegraph. Telegraph Media Group. Retrieved December 9, 2017.
- Robertson, Adi (May 15, 2013). "Google adds button-free voice search in Chrome: just say 'OK Google'". The Verge. Vox Media. Retrieved December 9, 2017.
- Lee, Jessica (May 23, 2013). "Google Talks Back: Conversational Search Available on New Version of Chrome". Search Engine Watch. Retrieved December 9, 2017.
- Albanesius, Chloe (November 27, 2013). "'OK Google' Voice Search Lands on Chrome". PC Magazine. Ziff Davis. Retrieved December 9, 2017.
- Protalinski, Emil (October 16, 2015). "Google removes 'OK Google' voice search from Chrome". VentureBeat. Retrieved December 9, 2017.
- Shahani, Aarti (May 18, 2016). "With New Products, Google Flexes Muscles To Competitors, Regulators". NPR. Retrieved December 15, 2017.
- Gartenberg, Chaim (May 26, 2017). "Google adds new Personal tab to search results to show Gmail and Photos content". The Verge. Vox Media. Retrieved May 27, 2017.
- Westenberg, Jimmy (May 28, 2017). "New Personal tab in Google Search will show results from Photos, Gmail, and more". Android Authority. Retrieved December 15, 2017.
- Lardinois, Frederic (June 20, 2017). "Google launches its AI-powered jobs search engine". TechCrunch. AOL. Retrieved June 22, 2017.
- Gebhart, Andrew (June 20, 2017). "Google for Jobs is ready to help your employment search". CNET. CBS Interactive. Retrieved June 22, 2017.
- Bell, Karissa. "Google is using your entire search history to create a personalized news feed". Mashable. Retrieved 2018-05-22.
- "Google is putting a news feed in Android's home screen". The Verge. Retrieved 2018-05-22.
- Larson, Selena. "The Google app feed is about to get more personal". CNNMoney. Retrieved 2018-05-22.
- Schwartz, Barry (May 20, 2013). "Google Drops "Translated Foreign Pages" Search Option Due To Lack Of Use". Search Engine Land. Retrieved December 15, 2017.
- Mayer, Marissa (September 8, 2010). "Search: now faster than the speed of type". Official Google Blog. Google. Retrieved December 15, 2017.
- Wagner, Matt Van (September 20, 2010). "How Google Saved $100 Million By Launching Google Instant". Search Engine Land. Retrieved December 15, 2017.
- Gomes, Ben (September 9, 2010). "Google Instant, behind the scenes". Official Google Blog. Google. Retrieved December 15, 2017.
- Pash, Adam (September 8, 2010). "How to Turn Off Google Instant Search". Lifehacker. Univision Communications. Retrieved December 15, 2017.
- Axon, Samuel (September 28, 2010). "Which Words Does Google Instant Blacklist?". Mashable. Ziff Davis. Retrieved December 15, 2017.
- Horn, Leslie (September 29, 2010). "Google Instant Blacklist: Which Words Are Blocked?". PC Magazine. Ziff Davis. Retrieved December 15, 2017.
- Schwartz, Barry (July 26, 2017). "Google has dropped Google Instant Search". Search Engine Land. Retrieved December 15, 2017.
- Statt, Nick (July 26, 2017). "Google will stop showing search results as you type because it makes no sense on mobile". The Verge. Vox Media. Retrieved December 15, 2017.
- "SSL Search: Features – Web Search Help". Web Search Help. Google. May 2010. Retrieved July 7, 2010.
- "Encrypted.google.com". Encrypted.google.com. Retrieved August 4, 2012.
- "Google Will Start Encrypting Your Searches". TIME Magazine. 13 March 2014. Retrieved February 6, 2017.
- "Encrypted.google.com is going away". Google, Inc. Retrieved May 18, 2018.
- Krebs, Brian (January 31, 2009). "Google: This Internet May Harm Your Computer". The Washington Post. Retrieved January 31, 2009.
- Mayer, Marissa (January 31, 2009). "This site may harm your computer on every search result?!?!". The Official Google Blog. Google. Retrieved January 31, 2009.
- Weinstein, Maxim (January 31, 2009). "Google glitch causes confusion". StopBadware.org. Archived from the original on July 8, 2010. Retrieved May 10, 2010.
- Cooper, Russ (January 31, 2009). "Serious problems with Google search". Verizon Business Security Blog. Archived from the original on July 17, 2011. Retrieved May 10, 2010.
- "Once Again, A Google Murder Case, Jan 29, 2008". Search Engine Land. January 29, 2008. Retrieved August 4, 2012.
- "Google Anonymizing Search Records To Protect Privacy, March 14, 2007". Search Engine Land. March 14, 2007. Retrieved August 4, 2012.
- "DuckDuckGo". duckduckgo.com. Retrieved June 28, 2016.
- Caddy, Becca (20 March 2017). "Google tracks everything you do: here's how to delete it". Wired. blogspot. Retrieved March 20, 2017.
- "Google is encrypting search globally. That's bad for the NSA and China's censors". March 12, 2014. Retrieved July 7, 2018.
- "Google fined over Safari privacy violation." Al Jazeera, August 10, 2012.
- Bailey, Brandon. "Google's review by FTC nearing critical point." Mercury News, November 9, 2012.
- Beato, Augusto. "Google Redesign Backs Social Effort". Portland SEO. Portland SEO. Retrieved July 1, 2011.
- "Google redesigns its homepage". Latimesblogs.latimes.com. June 29, 2011. Retrieved August 4, 2012.
- "Google support forum, one of many threads on being unable to switch off the black navigation bar". Google.com. Retrieved August 4, 2012.
- "Google ads: The wolf is out of the lamb's skin". www.techmw.com. Retrieved December 2, 2013.
- Schwartz, Barry (6 December 2016). "Google begins rolling out a new desktop search user interface". Search Engine Land. blogspot. Retrieved December 6, 2016.
- "Google Search | About Google app". Retrieved 2018-05-30.
- Bohn, Dieter (December 6, 2016). "Google is putting a news feed in Android's home screen". The Verge. Vox Media. Retrieved December 15, 2017.
- Newton, Casey (July 19, 2017). "Google introduces the feed, a personalized stream of news on iOS and Android". The Verge. Vox Media. Retrieved December 15, 2017.
- Matney, Lucas (July 19, 2017). "Google introduces the feed, a news stream of your evolving interests". TechCrunch. Oath Inc. Retrieved December 15, 2017.
- Schwartz, Barry (April 19, 2016). "Google Testing Trending In Search Auto-Complete". Search Engine Roundtable. Retrieved December 15, 2017.
- Schwartz, Barry (August 11, 2016). "You Can Now Opt Out Of Trending Searches In The Google Search App". Search Engine Roundtable. Retrieved December 15, 2017.
- Perez, Sarah (September 1, 2017). "Google's Search app on iOS gets a Twitter-like Trends feature, faster Instant Answers". TechCrunch. Oath Inc. Retrieved December 15, 2017.
- "Language Preferences". www.google.com. Retrieved 2018-05-30.
- Khomami, Nadia (October 2, 2015). "Ex-Google employee owned google.com for one minute". The Guardian. Guardian Media Group. Retrieved December 15, 2017.
- Carson, Biz (September 30, 2015). "This guy bought 'Google.com' from Google for one minute". Business Insider. Axel Springer SE. Retrieved December 15, 2017.
- Luckerson, Victor (January 29, 2016). "Here's How Much Google Paid the Guy Who Bought Google.com". Time. Retrieved December 15, 2017.
- "Google: 100 Billion Searches Per Month, Search To Integrate Gmail, Launching Enhanced Search App For iOS". Searchengineland.com. August 8, 2012. Retrieved February 18, 2013.
- Blogspot.com, Powering a Google search
-  How does Ecosia neutralize a search's CO2 emissions?
-  Google Search Statistics
- Maurer, H.; Balke, Tilo; Kappe, Frank; Kulathuramaiyer, Narayanan; Weber, Stefan; Zaka, Bilal (September 30, 2007). "Report on dangers and opportunities posed by large search engines, particularly Google" (PDF). Graz University of Technology. Archived from the original (PDF) on December 29, 2009. Retrieved June 13, 2017.
- Parramore, Lynn (October 10, 2010). "The Filter Bubble". The Atlantic. Retrieved April 20, 2011.
Since Dec. 4, 2009, Google has been personalized for everyone. So when I had two friends this spring Google "BP," one of them got a set of links that was about investment opportunities in BP. The other one got information about the oil spill....
- Weisberg, Jacob (June 10, 2011). "Bubble Trouble: Is Web personalization turning us into solipsistic twits?". Slate. Retrieved August 15, 2011.
- AUTHOR: MOSTAFA M. EL-BERMAWY (November 18, 2016). "Your Filter Bubble is Destroying Democracy". Wired. Retrieved March 3, 2017.
...The global village that was once the internet ... digital islands of isolation that are drifting further apart each day ... your experience online grows increasingly personalized ...
- How Google Searches Pretty Much Nailed the New Hampshire Primary February 11, 2016
- Google Hacks from O'Reilly is a book containing tips about using Google effectively. Now in its third edition (2006). ISBN 0-596-52706-3.
- Google: The Missing Manual by Sarah Milstein and Rael Dornfest (O'Reilly, 2004). ISBN 0-596-00613-6
- How to Do Everything with Google by Fritz Schneider, Nancy Blachman, and Eric Fredricksen (McGraw-Hill Osborne Media, 2003). ISBN 0-07-223174-2
- Google Power by Chris Sherman (McGraw-Hill Osborne Media, 2005). ISBN 0-07-225787-3
- Barroso, Luiz Andre; Dean, Jeffrey; Hölzle, Urs (2003). "Web Search for a Planet: The Google Cluster Architecture". IEEE Micro. 23 (2): 22–28. doi:10.1109/MM.2003.1196112.