Forechecking is a defensive strategy used in ice hockey where players pressure the opposing team in their own zone to regain possession of the puck. This tactic aims to disrupt the opponent's ability to move the puck out of their defensive area, forcing them into mistakes or turnovers. There are different types of forechecking systems, such as the 1-2-2 and 2-1-2 formations, which refer to the arrangement of players on the ice. Effective forechecking can lead to scoring opportunities and is a crucial aspect of a team's overall defensive play.