Five-a-side football is football with five players on each team, not eleven. The pitch is smaller, the game is faster, and it is very often played indoors. In Britain it is a hugely common way to play after work or at a sports centre. A side here means a team, not the side of the field. Though actually it sits close to futsal, it is not always the same sport: futsal has its own ball, court, and official rules. Five-a-side is the everyday British name for the five-player game, which may or may not follow those rules.

五人制足球（和 futsal 很近，但不一定是同一套正式規則）