What are Spiders ?

A spider is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index. The major search engines on the Web all have such a program, which is also known as a "crawler" or a "bot."
 
Googlebot is the software used by Google to fetch and render web documents collectively. They crawl each web page and its contents and store them in the Google index under the relevant keywords of the website. Google bots are also known as Spiders and Crawlers.
 
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