file editor : indent function ?

Hi,

I have a stupid question : does exist a "indent" menu, like the
"comment/uncomment" one ? This function role is to correctly indent the
selected block in the edited file. I ask the question because 1) I
didn't find the function in the menus 2) the indentation function exist
when the key "return" is pushed 3) emacs do that very well 4) I HATE
DOING STUPING THINGS like manually indent a file !-)

Thanks,

Ug!