The rock in basketball is a slang term used for the basketball. Saying the rock is equivalent to saying the ball in most cases. The ball is an orange round ball that is made from leather or rubber, depending on whether the ball is for indoor or outdoor basketball. The rock is a term to describe different basketball actions used by many including players, announcers, and fans. The rock is essential to any basketball game, because the ball is the most vital part of basketball. Without a 'rock', you can't play basketball.
Here are some basic examples of the term: