Indoor soccer is one of the most popular sports, played in an enclosed space or indoor arena. There are a few synonymous terms used to describe the game, such as arena soccer, futsal, and indoor football. Arena soccer and indoor football are very similar to indoor soccer, though the former is more commonly associated with professional leagues, while the latter is more commonly known throughout Europe. Futsal, on the other hand, is a type of indoor soccer that originated in South America, characterized by a smaller ball and a smaller playing area. The sport has become increasingly popular worldwide, with professional leagues and tournaments held around the globe.