Water polo is a competitive team sport played in the water between two teams. The game consists of four quarters, in which the two teams attempt to score goals by throwing the ball into their opponent's goal. The team with the most goals at the end of the game wins the match. Each team made up of six field players and one goalkeeper, with typically six additional players available for substitution throughout the match. Except for the goalkeeper, players participate in both offensive and defensive roles. Water polo is typically played in an all-deep pool seven feet (or two meters) deep.