what is search engine how it work
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It keeps doing this, building up a huge index ofmany webpages as it goes. Some websites stop web crawlers from visiting them. These pages will be left out of the index, along with pages that no-one links to. The information that the web crawler puts together is then used by search engines.
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Search engines allow users to search the internet for content using keywords. Although dominated by a few, there are several search engines that people can use. When a user enters a keyword or key phrase into a search engine, a search engine results page (SERP) is returned, ranking the found pages in order of their relevance
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