What is the use of Robots.txt?

Robots.txt file tells the search engines spider which pages to access and index on your website and which pages not...
 
The robots.txt is a simple text file in your web site that informs search engine bots how to crawl and index website or web pages. It is great when search engines frequently visit your site and index your content but often there are cases when indexing parts of your online content is not what you want.
 
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