What do people mean when they say wrestling is “fake”?

I’m not a huge wrestling fan and don’t know much about WWE aside from the video games. Forgive me if my question is out of line.

I often hear people say that wrestling (specifically WWE wrestling) is “fake”. But I don’t really know what that means.

Like I get that there is some showmanship to what they do and the personas are exaggerated.

But the wrestlers still have to do the stuff, right?

So how “fake” is it? How choreographed are the matches? Are the winners decided ahead of time?