Football is a family of team sports that involve, to varying degrees, kicking a ball with the foot to score a target Unqualified, the word football is understood to refer to whichever form of football is the most common in the regional context in which the word seems. The center judge is responsible for spotting the football immediately after each and every play, and has quite a few of the identical responsibilities as the referee, except announcing penalties. Variants of football have been codified for lowered-sized teams (i.e. 5-a-side football ) play in non-field environments (i.e. beach soccer , indoor soccer , and futsal ) and for teams with disabilities (i.e. paralympic association football ).