When a team loses possession of the puck in the attacking zone they need to be quick to stop players on the opposing team bringing the puck into their defensive zone to score a goal. They can help defend against goals through an effect backcheck.
Backchecking is a strategy in ice hockey where players transition from offense to defense moving quickly from the attacking zone to the defensive zone to neutralize opposing players.
Players will skate back to the defensive zone and then turn to face opposing players preventing them from having a clear breakaway. An effective backcheck can have multiple defensive players guarding a single opposing player.