Football is a game played between two teams of 11 players, including one goalkeeper, the 10 outfield players can not touch the ball, but the goalkeeper can, within the goal box. If the outfield player touches the ball with his hand then the opposing team wins a free kick, outside of the box and can play however hey want. But if they touch the ball inside the goal-box then the opposing team earn a free-kick from inside the box and have a better opportunity to score a goal. If the ball goes out of play then the opposing team gets a throw-in and throw the ball in over there head to one of there teammates.
Football is a family of team sports that involve, to varying degrees, kicking a ball to score a goal. Unqualified, the word football is understood to refer to whichever form of football is the most popular in the region.