Whether you're a volleyball player or a fan, it is important to understand the game's rules. For instance, only six players play on the floor, with two in the front and two in the back row. Players earn points for every serve to the winning team of the rally. The ball can be played off the net during a serve or volley, and it is only out if it hits the antennae or floor outside the court. While players can touch the ball with any part of their body, it's illegal to hold, throw or catch the ball.