Web crawlers, also identified as web spiders or Net bots, are plans that automatically browse the Internet to index content. Crawlers can see all kinds of data like content, links on a page, broken links, sitemaps, and HTML code validation.
Search appliances such as Google, Bing, and Yahoo use crawlers to correctly index took pages so that users can find them quicker and more professionally when searching. Without web crawlers, there is nothing to tell you that your website has new and updated content. Sitemaps can play a role here too. So for the most part, web crawlers are a good thing. However, sometimes there are also scheduling and loading issues, as a crawler may be constantly voting your site. This file can help regulator trace traffic and ensure that your server is not overloaded.
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