How does grading on a curve work exactly?

Question

It wasn’t something that happened when I was in school and I’ve heard absolutely venomous descriptions of it, but no one seems to be able to tell me how it works exactly

In:

Answer 1

Take highest score from a class. Say it’s a 93. Then add 7 points to that to make it 100. Then you add 7 points to everyone else’s paper.