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Football is a family of team sports that involve, to varying degrees, kicking a ball with the foot to score a goal. Unqualified, the word football is understood to refer to whichever form of football is the most popular in the regional context in which the word appears. Sports commonly called `football` in certain places include: association football known as soccer in some countries; gridiron football specifically American football or Canadian football; Australian rules football; rugby football either rugby league or rugby union; and Gaelic football.[1][2] These different variations of football are known as football codes.