A search engine is an information retrieval system designed to help find information stored on a computer system, such as on the World Wide Web, inside a corporate or proprietary network, or in a personal computer. The search engine allows one to ask for content meeting specific criteria (typically those containing a given word or phrase) and retrieves a list of items that match those criteria. This list is often sorted with respect to some measure of relevance of the results. Search engines use regularly updated indexes to operate quickly and efficiently.Without further qualification, search engine usually refers to a Web search engine, which searches for information on the public Web. Other kinds of search engine are enterprise search engines, which search on intranets, personal search engines, and mobile search engines. Different selection and relevance criteria may apply in different environments, or for different uses.
Some search engines also mine data available in newsgroups, databases, or open directories. Unlike Web directories, which are maintained by human editors, search engines operate algorithmically or are a mixture of algorithmic and human input
Yahoo! Search
Yahoo! Search helps users find information, news, images, video, products, local services, and answers from around the Web.search.yahoo.com
Google (Nasdaq: GOOG)
Main site for the Google search engine, finding web sites that match a user's query. Also includes Image Search, Local Search, Google News, and Froogle.www.google.com
Dogpile
Dogpile fetches and ranks results from multiple search engines, letting you search for key words, pictures, audio, video, news, or phone numbers from a single page. ...www.dogpile.com
AltaVista
AltaVista provides web and newsgroup search engines, as well as paid submission services.www.altavista.com
WebCrawler
Metasearch results from popular engines and directories.www.webcrawler.com
HotBot
Search engine that offers custom filters, skins, and access various other engines.www.hotbot.com
MetaCrawler
Search service that relies on the databases of other search engines.www.metacrawler.com
AllTheWeb
Search engine which indexes web pages, as well as multimedia, audio, FTP, PDF, and MS Word files from around the world.www.alltheweb.com
Search Engine Watch
Provides tips and information about searching the web, analysis of the search engine industry, and help to site owners trying to improve their ability to be found in ...www.searchenginewatch.com
Lycos
Official site for Lycos, the online destination site combining elements of navigation, community, and commerce.www.lycos.com
Ask.com
The Ask.com search engine allows users to find online information by asking a question, entering a phrase, or giving a key word. Formerly Ask Jeeves.www.ask.com
Vivísimo
Offers organized search results with document clustering. Makers of the Clusty search engine.www.vivisimo.com
WiseNut
Employs a context-sensitive ranking algorithm to return search results by degrees of relevance.www.wisenut.com
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