Football is the name given to a number of different, but related, team sports. The most popular of these worldwide is Association football, which also goes by the name of soccer. The English language word football is also applied to Rugby football (Rugby union and Rugby league), North American football (American and Canadian), Australian rules football, and Gaelic football.

While it is widely believed that the word football, or "foot ball", originated in reference to the action of a foot kicking a ball, there is a rival explanation, which has it that football originally referred to a variety of games in medieval Europe, which were played on foot.Professional Football Researchers Association Origins of Football These games were usually played by peasants, as opposed to the horse-riding sports often played by aristocrats. While there is no conclusive evidence for this explanation, the word football has always implied a variety of games played on foot, not just those that involved kicking a ball. In some cases, the word football has been applied to games which have specifically outlawed kicking the ball. (See football (word) for more details.)

All football games involve scoring with a spherical or ellipsoidal ball (itself called a football), by moving the ball into, onto, or over a goal area or line defended by the opposing team. Many of the modern games have their origins in England, but many peoples around the world have played games which involved kicking and/or carrying a ball since ancient times.