It is played on any regular squash court and is similar to squash. In Racketball a larger ball, which does not need warming up like in squash, and a shorter racket are used.
As the ball is bigger, more bouncy and does not need warming up means that the rallies last longer as the ball moves slower giving the opponent more time to react and get to the ball.
The shorter racket also helps with hand eye coordination making the ball easier to strike. Overall this makes the game much easier to pick up than many other sports like squash or tennis.