How do you exit vimdiff mode in vim, specifically, for Fugitive?

Question

I am using vim with the fugitive extension. It has a :Gdiff command which brings you into vimdiff mode, but what is the right/quick way to close/quit vimdiff mode?

I.e.,

Answer 1

An alternative to , if you have multiple windows, would be move to the other diff window and do c, which close only one window.

If you close the wrong diff window do a :Gedit

Be careful and don't confuse c with