What is remote execution?

I'm still relatively new to all of this so I would like to know what remote execution is. I understand you have to have a bypass, in my case VA, but what does RE do in terms of menus and stuff? I'm asking this because I've downloaded some menus where the RE has been detected. Also, working RE's seem to be a very desirable for many folks. Can someone enlighten me?

Thanks!

basically they let you spawn vehicles, crates and nuke shit. i think all public ones are detected or partially detected

Thanks, does anyone have a working remote execution for sale?