Is the robots.txt file necessary for seo?

[letthemusic]

hi,

i know that in the robots.txt file i can tell google what pages on my site not to crawl.

are there any other uses of this file?

can it be useful for seo in any way?

i dont think theres any pages on my site that i dont want search engines to crawl so im thinking i might not need this file unless there are other reasons for it


thanks.