What is the use of web crawler in information retrieval?
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web crowleris an internet bot that systematically browses the www typically for the purpose of web indexing (web spidering).
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the search engines used extremely efficient software called spider or web crawler... the spiders continuously crawl on a web to come out any newly published web documents news letters and find their web addresses....as soon as a user enters a keyword in a search engine , these spiders crawl from one server to another in a matter of microseconds to compile a massive list of matching results...
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