What are rubber bands on braces for?

Question

I have to make a square around four of my teeth on each side of my mouth with the rubber bands and I was wondering what they were for.

Answer 1

To Correct your overbite, under bite or overjet.

The other answers are incorrect.

Answer 2

To move your jaw.  

Answer 3

my friend who has braces told me it was to keep ur jaw together

Answer 4

its to move your teeth, fix an over bit, straighten them up a bit, and keep your jaw in the form it should be so your teeth will move to the correct spot.