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What is a Web crawler and how does it work?
What is a Web crawler and how does it work?
A web crawler is a computer program that is used to search through millions of websites that are available on the internet according to a search query provided by the user. They may use any of the algorithms that can return the list of websites that are relevant with the query like A star, Page rank etc.The term crawling literally means scanning through any piece of text, be it links to other websites, image captions, descriptions, articles, anything. It's like a spider searching through the web.
Web crawlers go by many names, including spiders, robots, and bots, and these descriptive names sum up what they do — they crawl across the World Wide Web to index pages for search engines.

Search engines don’t magically know what websites exist on the Internet. The programs have to crawl and index them before they can deliver the right pages for keywords and phrases, or the words people use to find a useful page.

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