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Old 12-25-2016, 11:43 PM   #35
Ajaysharma
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Join Date: Nov 2016
Posts: 372
Web crawlers/Web spider are mainly used -

1)to create a copy of all your visited pages for later processing by a search engine that will index the downloaded pages to provide fast searches.
2)for automating maintenance tasks on a Web site, such as checking links or validating HTML code.
3)to gather specific types of information from Web pages, such as harvesting e-mail addresses (usually for sending spam)
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