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A web crawler, also known as a spider or spiderbot, is an internet bot that systematically browses the World Wide Web, typically operated by search engines for the purpose of web indexing1. Web crawlers copy pages for processing by a search engine, which indexes the downloaded pages so that users can search more efficiently1.
How Web Crawlers Work
A web crawler starts with a list of URLs to visit, known as seeds. As the crawler visits these URLs, it identifies all the hyperlinks in the retrieved web pages and adds them to the list of URLs to visit, called the crawl frontier1. URLs from the frontier are recursively visited according to a set of policies. If the crawler is performing web archiving, it copies and saves the information as it goes1.
Policies Governing Web Crawlers
The behavior of a web crawler is determined by several policies
Learn moreâś•This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links. - See all on Wikipedia
Web crawler - Wikipedia
A Web crawler, sometimes called a spider or spiderbot and often shortened to crawler, is an Internet bot that systematically browses the World Wide Web and that is typically operated by search engines for the purpose of Web indexing (web spidering). Web search engines and some other websites use … See more
A crawler must not only have a good crawling strategy, as noted in the previous sections, but it should also have a highly optimized architecture.
Shkapenyuk and … See moreWeb crawlers typically identify themselves to a Web server by using the User-agent field of an HTTP request. Web site administrators typically examine their Web servers' … See more
A Web crawler starts with a list of URLs to visit. Those first URLs are called the seeds. As the crawler visits these URLs, by communicating with web servers that respond to those URLs, it identifies all the hyperlinks in the retrieved web pages and adds them to the … See more
The behavior of a Web crawler is the outcome of a combination of policies:
• a selection policy which states the pages to download, See moreWhile most of the website owners are keen to have their pages indexed as broadly as possible to have strong presence in search engines, web crawling can also have unintended consequences and lead to a compromise or data breach if a search engine … See more
A vast amount of web pages lie in the deep or invisible web. These pages are typically only accessible by submitting queries to a … See more
Wikipedia text under CC-BY-SA license What is a web crawler? | How web spiders work
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