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Web search databases are assembled from information collected by other programs called "Web robots" (or sometimes "spiders" or "Webcrawlers"). These programs are essentially automated browsers that methodically roam the Web, collecting information about the documents they encounter and, rather than immediately displaying the information to a human reader, saving it for inclusion in the databases. Then, when you access a Web search engine, these engines quickly search the database, looking for matches to the keywords that you have supplied.
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