how search engine search information on the World Wide Web?
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Search engine technologies are evolving fast as well. There are three main types of search engines: Crawler–based search engines, such as Google and Altavista, which use programs that crawl the Web and create search engine indices. Web directories, such as Yahoo, which depend on humans for their hierarchical listings.
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Search engines have their own crawlers, small bots that scan websites on the world wide web. These little bots scan all sections, folders, subpages, content, everything they can find on the website. Crawling is based on finding hypertext links that refer to other websites.
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