spider

Web Crawler

A web crawler (also known as a Web spider or Web robot) is a program or automated script which browses the World Wide Web in a methodical, automated manner.

This process is called Web crawling or spidering. Many legitimate sites, in particular search engines, use spidering as a means of providing up-to-date data. Web crawlers are mainly used to create a copy of all the visited pages for later processing by a search engine, that will index the downloaded pages to provide fast searches. Crawlers can also be used for automating maintenance tasks on a Web site, such as checking links or validating HTML code. Also, crawlers can be used to gather specific types of information from Web pages, such as harvesting e-mail addresses (usually for spam).

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  • The listing of web pages returned by a search engine in response to a keyword query.
  • A web page reached after clicking a link or advertisement.
  • Provide information about a given webpage to help search engines catagorize them correctly.
  • A open content directory of links that is constructed and maintained by a community of volunteer editors.
  • The language used in creating web pages.

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