In principle, a tracker is like a librarian. It searches the web for information that it assigns to specific categories and then indexes and catalogues it to retrieve and interpret the data it tracks.
The operations of these computer programs must configure before starting a scan. Therefore, each order defined in advance. The crawler then executes these instructions automatically. The crawler results used to create an index that the output software can access.
The information a tracker collects from the web depends on the instructions.
This graphic shows the links displayed by a crawler:
Web Crawler
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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