Defender (DF)
Defenders play behind the midfielders and their primary responsibility is to provide support to the team and to prevent the opposition from scoring a goal. They usually remain in the half of the field that contains the goal they are defending. Taller defenders will move forward to the opposing team's penalty box when their team takes corner kicks or free kicks, where scoring with one's head is a possibility.
Many centre-backs have the ability to bring the ball out of defence and begin counter-attacks for their own teams, thanks to tactical (game reading, anticipation, positioning, tackling) and technical (passing, vision on the pitch) capabilities.
Read more about this topic: Association Football Positions