What is robots.txt?

[shakthipriya]

Robots.txt is a text file you put on your site to tell search robots which pages you would like them not to visit. Robots.txt is by no means mandatory for search engines but generally search engines obey what they are asked not to do. It is important to clarify that robots.txt is not a way from preventing search engines from crawling your site and the fact that you put a robots.txt file is something like putting a note “Please, do not enter” on an unlocked door. That is why we say that if you have really sensitive data, it is too naïve to rely on robots.txt to protect it from being indexed and displayed in search results.