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A crawl is a system that trips Websites and flows their webpages and other information to make records for look for engines index. Google on the Web all have such a system, which is also known as a "spider" or a "bot." Spiders are typically designed to visit websites that have been presented by their owners as new or updated. Entire websites or specific webpages can be precisely frequented and listed. Spiders apparently obtained the name because they crawl through a website a page at a time, following the links to other webpages on the website until all webpages have been read.
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