Volleyball is played by two teams on a court divided by a net. The basic rules are that a team can hit the ball up to three times before it must cross the net, a serve must pass over the net into the opponent's court without touching a teammate, and points are scored when the opposing team fails to return a ball or hits it out of bounds. The key skills in volleyball are serving to put the ball into play, passing to control the ball's direction, setting to prepare for a spike over the net, spiking to attack the opponent's court, blocking at the net to defend, and digging to save balls that reach the defense. Hand signals are used by referees to indicate fouls and the result