also what's the difference between ladder and rank(ing)?

on a ladder people occupy places 1, 2, 3, 4 etc.
when you win with someone you move up half the distance between your position and your opponent;

ranking is a completely different, separate system; you get 1200 poitns in the beginning and then lose it or gain depending on who you win/lose against..

Thanks！
I think ranking is just points.
ladder is level,really?