Futsal (also known as futsal or footsal) is a variant of soccer played on a hard court, smaller than a soccer field, and mainly indoors. Futsal is played between two teams of five players each, one of whom is the goalkeeper. Unlimited substitutions are permitted. Unlike some other forms of indoor soccer, the game is played on a hard court surface delimited by lines; walls or boards are not used. Futsal is also played with a smaller, harder, low-bounce ball. The surface, ball, and rules together favor ball control and passing in small spaces. The emphasis is on improvisation, creativity and technique.