A defenseman is a player in ice hockey whose primary role is to prevent the opposing team from scoring. They typically play on the blue line, which is the line that separates the offensive and defensive zones. Defensemen work to block shots, intercept passes, and clear the puck from their defensive zone. In addition to their defensive responsibilities, defensemen also contribute to their team's offense by joining the attack and assisting in scoring opportunities. They often have strong skating skills and are proficient in handling the puck. Notable defensemen in the NHL include players like Bobby Orr and Nicklas Lidström.