Is it necessary to use Robots.txt?

My question is, Is it necessary to use Robots.txt?

Robots.txt is text file inserted into the website to contain instructions for search engine robots. The file lists web pages that are allowed and disallowed from search engine crawling. They help to control the search engine robots in your website.

Yes, Robots helps to avoid the secured webpages crawl by search engines and search engine are not show in results.

robots.txt is very important for any website to control from search engine bot

Yes, Robots text is helps to avoid the protected webpages crawl by search engines and search engine are not show in results.

Yes Robots.txt is text file put into the website to contain instructions for search engine robots. The file lists web pages that are allowed and disallowed from search engine crawling. They help to control the search engine robots in your website.