Linemen are essential players in American football, primarily responsible for blocking and protecting the quarterback. They line up on the offensive or defensive line, where their main goal is to create space for running plays or to stop the opposing team's advances. Offensive linemen work to keep defenders away from the quarterback, while defensive linemen aim to tackle the ball carrier or pressure the quarterback. There are different types of linemen, including offensive linemen and defensive linemen. Offensive linemen include positions like tackles, guards, and centers, while defensive linemen consist of defensive tackles and defensive ends. Each position has specific roles and responsibilities that contribute to the overall strategy of the game.