The term "futsal" comes from "futbol de salon" or "indoor soccer." Futsal is a five-a-side version of soccer played indoors on a basketball-sized court (no walls). Futsal has experienced tremendous growth and is the only indoor version of soccer with a sanctioned world championship. The sport is played internationally, with recognized continental and club championships. Futsal is the only "official form of Indoor Soccer" as approved by (FIFA) Federation Internationale de Football Association. It is played in all the continents of the world by over 100 countries and has 12 million players.