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In computing, a news aggregator, also termed a feed aggregator, feed reader, news reader, RSS reader or simply aggregator, is client software or a web application which aggregates syndicated web content such as news headlines, blogs, podcasts, and video blogs (vlogs) in one location for easy viewing.
Visiting many separate websites frequently to find out if content on the site has been updated can take a long time. Aggregation technology helps to consolidate many websites into one page that can show the new or updated information from many sites. Aggregators reduce the time and effort needed to regularly check websites for updates, creating a unique information space or personal newspaper. Once subscribed to a feed, an aggregator is able to check for new content at user-determined intervals and retrieve the update. The content is sometimes described as being pulled to the subscriber, as opposed to pushed with email or IM. Unlike recipients of some pushed information, the aggregator user can easily unsubscribe from a feed.
The aggregator provides a consolidated view of the content in one browser display or desktop application. Aggregators with podcasting capabilities can automatically download media files, such as MP3 recordings. In some cases, these can be automatically loaded onto portable media players (like iPods) when they are connected to the end-user's computer.
By 2011, so-called RSS-narrators appeared, which aggregated text-only news feeds, and converted them into audio recordings for offline listening.
The variety of software applications and components that are available to collect, format, translate, and republish XML feeds is a testament to the flexibility of the format and has shown the usefulness of presentation-independent data.
News aggregation websites 
Examples of this sort of website are the Drudge Report and the Huffington Post., Google News, Newsvine and World News (WN) Network, where aggregation is entirely automatic, using algorithms which carry out contextual analysis and group similar stories together, and JockSpin, which aggregates and categorizes most headlines automatically, but supplements with manually curated headlines as well as its own articles.
News aggregation websites started with sites like the Drudge Report, NewsNow, Breitbart.com and the Huffington Post, where content was still entered by humans. Sites such Google News, on the other hand, are based on algorithms filling the content from a range of either automatically selected or manually added sources.
Web-based feed readers 
Web-based feeds readers allow users to find a web feed on the internet and add it to their feed reader. Online feed readers include Bloglines, Feedly, Google Reader (discontinuing July 1, 2013), My Yahoo!, NewsBlur and Netvibes. These are meant for personal use and are hosted on remote servers. Because the application is available via the web, it can be accessed anywhere by a user with an internet connection.
More advanced methods of aggregating feeds are provided via Ajax coding techniques and XML components called web widgets. Ranging from full-fledged applications to small fragments of source code that can be integrated into larger programs, they allow users to aggregate OPML files, email services, documents, or feeds into one interface. Many customizable homepage and portal implementations provide such functionality.
In addition to aggregator services mainly for individual use, there are web applications that can be used to aggregate several blogs into one. One such variety—called planet sites—are used by online communities to aggregate community blogs in a centralized location. They are named after the Planet aggregator, a server application designed for this purpose.
Feed reader applications 
Feed aggregation clients are applications installed on a PC, smartphone or tablet computer, designed to collect web feed subscriptions and group them together using a user-friendly interface. The graphical user interface of such applications often closely resembles that of popular e-mail clients, using a three-panel composition in which subscriptions are grouped in a frame on the left, and individual entries are browsed, selected, and read in frames on the right.
Software aggregators can also take the form of news tickers which scroll feeds like ticker tape, alerters that display updates in windows as they are refreshed, web browser macro tools or as smaller components (sometimes called plugins or extensions), which can integrate feeds into the operating system or software applications such as a web browser. Clients applications include Mozilla Firefox, Microsoft Office Outlook, iTunes, FeedDemon and many others.
Media aggregators 
Media aggregators are sometimes referred to as podcatchers due to the popularity of the term podcast used to refer to a web feed containing audio or video. Media aggregators are client software or web-based applications which maintain subscriptions to feeds that contain audio or video media enclosures. They can be used to automatically download media, playback the media within the application interface, or synchronize media content with a portable media player.
Feed filtering 
One of the problems with news aggregators is that the volume of articles can sometimes be overwhelming, especially when the user has many web feed subscriptions. As a solution, many feed readers allow users to tag each feed with one or more keywords which can be used to sort and filter the available articles into easily navigable categories. Another option is to import the user's Attention Profile to filter items based on their relevance to the user's interests.
See also 
- Comparison of feed aggregators
- History of web syndication technology
- Web feed
- Metasearch engine
- Luscombe, Belinda (2009-03-19). "Arianna Huffington: The Web's New Oracle". Time (Time Inc). Retrieved 2009-03-30. "The Huffington Post was to have three basic functions: blog, news aggregator with an attitude and place for premoderated comments."
- "Worldnews Network picks up El Naschie interview". 2010-04-19.
- "Google News and newspaper publishers: allies or enemies?". Editorsweblog.org. World Editors Forum. Retrieved 2009-03-31.
- Chitu, Alex. "No More Google Reader". Google Operating System. Blogger. Retrieved 14 March 2013.
- "YC-Backed NewsBlur Takes Feed Reading Back To Its Basics". TechCrunch. July 30, 2012.
- "Need A Google Reader Alternative? Meet Newsblur". Search Engine Land. March 14, 2013.
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