The user-agent command in a robots.txt file sets permissions for search engine bots visiting a website. It lets webmasters specify which bots are allowed. The command "user-agent: *" opens the website to all search engine bots.

The user-agent command in a robots.txt file sets permissions for search engine bots visiting a website. It lets webmasters specify which bots are allowed. The command "user-agent: *" opens the website to all search engine bots.
