I was playing basketball, and when i jumped i landed on the side of my foot. i heard a crack and hurt my ankle. now it's swollen and hurts if i moveit?

Sprain vs break: It sounds like you may have sprained or fractured your ankle. You should see your doc for an evaluation, which might include x-rays. Unless surgery in indicated, the treatment will include rest, ice, compression and elevation.

Ice & X ray: Immediate icing and stay off that ankle. Need to go to er to get c ray and possible cast or splint or other.