In the sport of association football, each of the eleven players on a team is assigne to a particular position on the field of play. A team is made up of one goalkeeper and ten outfield players who fill various defensive, midfield and attacking positions depending on the formation deployed. These positions describe both the player's main role and their area of operation on the pitch. As the game has evolved, tactics and team formations have changed, and the names of the positions and the duties involved have evolved as well.