Search engine results page
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A Search Engine Results Page (SERP) is the listing of results returned by a search engine in response to a keyword query. The results normally include a list of items with titles, a reference to the full version, and a short description showing where the keywords have matched content within the page. A SERP may refer to a single page of links returned, or to the set of all links returned for a search query.
Components of SERP 
SERPs of major search engines like Google, Yahoo!, may include different types of listings: contextual, algorithmic or organic search listings, as well as sponsored listings, images, maps, definitions, videos or suggested search refinements.
The major search engines visually differentiate specific content types, such as images, news, and blogs. Many content types have specialized SERP templates and visual enhancements on the main search result page.
There are basically three main components of SERP: Searcher's Query, Organic SERP Listings and Paid SERP Listings.
Organic SERP listings 
These are the natural listings generated by search engines based on a series of metrics that determines their relevance to the searched term. Web pages that score well on a search engine's algorithmic test shows in this list.
Paid SERP listings 
These are advertisements, or sponsored links, included by search engines in their search results. Websites pay search engines to have their web pages listed here. This service is quite different from pay per click.
Generation of SERP 
Major search engines like Google, Yahoo! and Bing primarily use content contained within the page and fallback to metadata tags of a web page to generate the content that makes up a search snippet. The html title tag will be used as the title of the snippet while the most relevant or useful contents of the web page (description tag or page copy) will be used for the description.