Field hockey, commonly known as hockey, is a popular sport for men and women in many countries. It is played in open field.Two opposing teams try to drive the ball into the opponents' net with the help of curved sticks.The team putting the ball in opponents' net maximum scores the most. Each team is permitted to substitute any number of players during the game. A player who has been substituted may re-enter the field of play as a substitute for another player. Goal keeper wears a uniform different from that of their own team and that of their opponents. Players should not have dangerous spikes, studs or protruding nails in foot wear or wear anything that may be dangerous to other players. When a ball has passed completely and according to the rules over the goal-lines, between the goal posts and under the cross bars, a goal is scored. At that time the ball should be within the circle having been hit by the stick of an attacker. The team that scores greater number of goals shall be the winner.