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A search engine allows people to find web pages and sites that contfasthe engine returns the pages and sites that it determines to best match the search criteria. Each search engine has its own method of indexing a page to determine which ones rank best, note that most public search engines (i.e., Yahoo!, AltaVista, and Lycos) actually use both a page search engine and a directory search engine.

Types:
Search engine- Indexes the content of web pages automatically using existing hyperlinks and other metadata.