Hockey is a sport played between two teams who compete to score goals by putting a ball into the opposing team's goal. It can be played on grass, ice, or in swimming pools. A regulation match consists of two 35-minute halves. Each team has 11 players including a goalkeeper. Players use sticks to hit a ball and must keep the ball below their waists if an opponent is near. Positions include offense, midfield, and defense. The game has rules like restricting ball handling to sticks and requiring goals to be scored within a marked area in front of the net. Famous players include Luciana Aymar and Agustina Albertario.