That's right it is Volleyball. Volleyball is a team sport in which two teams of six players are separated by a net. Each team tries to score points by grounding a ball on the other team's court under organized rules. The play essentially proceeds as follows:

a player on one of the teams begins a 'rally' by serving the ball (tossing or releasing it and then hitting it with a hand or arm), from behind the back boundary line of the court, over the net, and into the receiving team's court. The receiving team must not let the ball be grounded within their court. The team may touch the ball up to three times to return the ball to the other side of the court, but individual players may not touch the ball twice consecutively. An attack is an attempt to direct the ball back over the net in such a way that the team receiving the ball is unable to pass the ball and continue the rally, thus, losing the point. The team that wins the rally is awarded a point and serves the ball to start the next rally.

A few most common faults include:

*Causing the ball to touch the ground or floor outside the opponents' court or without first passing over the net

*Catching and throwing the ball

*Double hit is two consecutive contacts with the ball made by the same player

*Four consecutive contacts with the ball made by the same team

*Net foul is touching the net during play

*Foot fault: the foot crosses over the boundary line when serving.

More Info: en.wikipedia.org