Where to put robots in website?

I has doubt where to put robots.

[viva]

Dear all

I have read one of the search engine optimize web site. He suggest me to have file robots.txt so I did and upload to my root directory. But another adviser say that I should write robots.txt on my HTML page. Which one should I follow and which advice is the correct one?

Thank you in advance.

[ncw164x]

this file goes in the root directory so when you type [your~site.com...] you will see the file

More info on this file
[searchengineworld.com...]

The one that goes on your html pages is a robots meta tag
[searchengineworld.com...]

hope this helps

[viva]

Thank you