From Wikipedia.com
The various codes of football share the following elements in common:
- Two teams of usually between 11 and 18 players; some variations that have fewer players (five or more per team) are also popular.
- A clearly defined area in which to play the game.
- Scoring goals or points, by moving the ball to an opposing team's end of the field and either into a goal area, or over a line.
- Goals or points resulting from players putting the ball between two goalposts.
- The goal or line being defended by the opposing team.
- Players being required to move the ball—depending on the code—by kicking, carrying, or hand-passing the ball.
- Players using only their body to move the ball.
In most codes, there are rules restricting the movement of players offside, and players scoring a goal must put the ball either under or over a crossbar between the goalposts. Other features common to several football codes include: points being mostly scored by players carrying the ball across the goal line; and players receiving a free kick after they take a mark or make a fair catch.
Peoples from around the world have played games which involved kicking or carrying a ball, since ancient times. However, most of the modern codes of football have their origins in England
