Is it necessary to use Robots.txt file?

Yes Afcouse, robots.txt file to give instructions about their site to web robots. a robots.txt file consists of one or more rules. Each rule blocks (or allows) access for a given crawler to a specified file path in that website.
 
Robots.txt is a content record website admins make to train web robots (commonly internet searcher robots) how to slither pages on their site. The robots.txt document is a piece of the robots rejection convention (REP), a gathering of web measures that control how robots slither the web, access and file substance, and serve that substance up to clients.
 
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