The basic rules involve one player starting a rally by serving the ball from behind the back boundary line. The ball can be touched only up to three times before returning it back over the net. The winning team is that which has scored the most, generally with the scoring process involving first to 25 points winning the set, and then best of five sets.
A variation on the game is Beach Volleyball, which is played by two teams on a sand covered court, or less formally, on a beach. The fundamental differences between indoor volleyball and beach volleyball include the team size, scoring system, overhead touches rules and the fact that coaching is not allowed. When watching beach volleyball you may see the players making hand signals behind their backs to the team mates. These 'blocking signals' identify which block they are planning to make, and which opponent to serve to.
The NGB for volleyball in England is Volleyball England.