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These are the search engines and directories, which provides search results for Yahoo.BingYahoo directoryGoogleWikipediaDmoz
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Search engines have two major functions: crawling and building an index, and providing search users with a ranked list of the websites they've determined are the most relevant. Thanks, Ekavat
The important point here about search results pages is that one main purpose of search engines is to provide searchers with relevant results.
Metasearch Engines
metasearch engines
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Meta search engines combine results from different search engines. Some examples of this are mamma.com and dogpile.com.
results come from the Yahoo Directory
Organic results refer to the unpaid results which are shown by search engines according to any search query.
A meta search engine (or aggregator) is a search instrument that uses another search engine's information to deliver their own particular results from the Internet. Meta search engines take data from a client and all the while convey inquiries to outsider search engines for results.
Google!