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A football is a ball used to play one of the various sports known as football. Each code of football uses a different ball, though they all belong to one of two different basic shapes:

1. a sphere: used in Association football (soccer) and Gaelic football;
2. a prolate spheroid ('oval-shaped'):
   • either with rounded ends: used in Rugby league football, Rugby union football and Australian rules football,
   • or with more pointed ends: used in American football and Canadian football.

The precise shape and construction of footballs is typically specified as part of the rules and regulations.