A defensive lineman is a player on a football team who lines up on the line of scrimmage, primarily responsible for stopping the opposing team's offense. They play a crucial role in defending against both the run and the pass. Their main tasks include tackling the ball carrier, pressuring the quarterback, and disrupting plays. Defensive linemen can be categorized into two main positions: defensive tackles and defensive ends. While defensive tackles typically play in the middle of the line and focus on stopping runs, defensive ends line up on the outside and often aim to sack the quarterback. Both positions require strength, speed, and agility.