Football is a family of team sports that involve, to varying degrees, kicking a ball to score a goal. Unqualified, the word football normally means the form of football that is the most popular where the word is used. Sports commonly called football include association football ; Australian rules football; Gaelic football; gridiron football ; International rules football; rugby league football; and rugby union football. These various forms of football share, to varying degrees, common origins and are known as "football codes".

A team sport is a type of sport where the fundamental nature of the game or sport necessitates the participation of multiple individuals working together as a team, and it is inherently impossible or highly impractical to execute the sport as a single-player endeavour. In team sports, the cooperative effort of team members is essential for the sport to function and achieve its objectives. The objective often involves teammates facilitating the movement of a ball or similar object in accordance with a set of rules in order to score points. Examples are basketball, volleyball, rugby, water polo, handball, lacrosse, cricket, baseball, and the various forms of football and hockey. These sports emphasize teamwork, strategy, and coordination among team members while competing against opposing teams to achieve a common goal. Team sports do not include individual or individual-to-team events within a sport.