This is a highly team oriented sport originating from USA. It is played by two teams ranging from five to eleven players depending on the division. The teams consists of an offense team which control the oval-shaped football in an attempt to advance down the field by running or passing the ball; and the defence team which aims to stop the offense advancement and take control of the ball. There are set rules enforced by the referees depending on the division. Points are obtained by advancing the ball into the endzone or kicking the ball through the goalpost. During games, players must be fully dressed with regulation outfits such as Helmet, Mouthguard, shoulder pad, Gloves, Pant Pads, Boot, …
The game is played in a rectangular field with Y-shaped goal post at both ends. The dimension of the field also varies depending on the division. Basic rule of playing is for the offense team to gain at least 10yard of field space with 4 downs (tries) else the defending team gets the ball and an opportunity to cover 10 yards in 4 downs.
Common postions of players are: QuaterBack(QB), RunningBack(RB), WideReceiver(WR), OffensiveTackle(OT), OffensiveGuard(OG), Center(C), TightEnd(TE), NoseGuard(NG), DefensiveTackle(DT), DefensiveEnd(DE), LineBack(LB), DefensiveBack(DB)[CornerBack(CB), Safty(SS)].