Web crawlers are the key components of Web search engines and systems that look into web pages. They help in indexing the Web entries and allow users to send queries against the index and also provide the webpages that match the queries. Another use of Web crawlers is in Web archiving, which involves large sets of webpages to be periodically collected and archived. Web crawlers are also used in data mining, wherein pages are analyzed for different properties like statistics, and data analytics are then performed on them.
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