A web crawler or spider is a software application that systematically browses the World Wide Web, typically for the purpose of web indexing.
Web crawlers are used by search engines and other web-based services to update their web content or indices of others sites’ content. They can also be used to find specific information on a website, using various search engine optimization (SEO) techniques, such as link analysis and site map.
Crawling is a process in which search engine bots visit every website they can find and index them in their database. They do this by following links on the site, downloading all content and storing it on their servers for future reference.
The crawling process is an essential part of how search engines work because it helps them return accurate results when someone searches for something online.
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