What is the difference between a 100% and any% for level runs?

I was wondering what counts and 100% and any%.

United States

I hate that Any% exists but I don't make the rules. basically: 100% is completing the level the way it is completed by completing the objective. Any% is where you have the level already completed and literally just run to the exit...

United States

you weren't suppose to do Any%, it's not fun... don't do those.