One of the biggest web crawler is Google that crawls the entire World Wide Web (WWW). Google has to traverse every page that exists on the Web and scrape/crawl the entire content.
A web crawler is a computer program that systematically browses the web page by page and also scrapes/crawls the content of the pages. A web crawler can also parse the next set of URLs to be visited from the crawled content. So, if these processes run indefinitely over the entire Web, we can crawl through all the web pages. Web crawlers are interchangeably also called spiders, bots, and scrapers. They all mean the same.
There are a few main points we need to think about before writing our first crawler. Now, every time a web crawler traverses a page, we must decide what kind of content we want to select and what content we want to ignore. For applications such as a search engine, we should ignore all the images, js files, css files, and other files and should concentrate only on HTML content that can...