What is offside and icing in hockey?

Offside in hockey occurs when a player enters the opponent's zone before the puck does. If a player is offside, the play is stopped, and a faceoff is held outside the zone where the infraction occurred.

Icing in hockey occurs when a player shoots the puck from behind the center red line across the opponent's goal line. If the opposing team's player is the first to touch the puck, icing is called, and a faceoff is held in the offending team's zone. However, in some leagues, including the NHL, icing can be waved off if the defending team's player is able to reach the puck before it crosses the goal line.