Review
Web crawlers, sometimes called spiders or bots, are automated programs that systematically browse the internet. Their main purpose is to discover and index web pages, helping search engines like Google understand the content and structure of websites. When a crawler visits a page, it reads the content, follows links to other pages, and records information about the site. This data is then used to build the search engine’s massive index, which allows users to find relevant information quickly when they perform a search. In essence, web crawlers are the unseen navigators that map the vast landscape of the internet.