Ice hockey is a sport that is played by two teams on ice. The players wear ice skates on their feet and can skate across the ice at very high speeds. They hold hockey sticks, which they use to push, shoot or pass a puck around the ice. The players score by shooting the puck into a net; the goaltenders try to stop them. Six players on each team play at once, but a whole team has over 20 players. Each team has 2 defenders, 3 forwards, and a goalie on the ice at a time. When a player breaks a rule, a referee calls a penalty, and the player has to sit in a penalty box for 2-4 minutes. While the player sits in the penalty box, his team has to play without him, and will have fewer players on the ice until the penalty is over.