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ANSWER:
A search engine is a Web-based software tool that enables users to locate
sites and pages on the Internet. To initiate a search, the user types
in a search phrase, and the engine then scans the Internet or parts of
the Internet to collect and list the Web sites that match the search criteria.
Along with Web directories, search engines are Web users' most important
search tools. Therefore, Web sites that are not featured in search engine
or Web directory indices will be seen by only a select few Internet users.
The most common type of search engine is a spider — or crawler.
A spider is a search engine that scans — or crawls — a Web
site by following the site's hyperlinks until all site elements have been
examined. Based on the site's contents, the spider determines the site's
relevance and ranking.
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