Indoor football is a sport that is played indoors on a smaller field than traditional outdoor football. There are several synonyms for indoor football that may be used interchangeably. One common synonym is arena football, which is the professional version of indoor football played on a 50-yard field. Another synonym for indoor football is indoor soccer, which is a similar sport played with a smaller ball. Other synonyms include futsal, which is a variant of indoor soccer played with a smaller and heavier ball, and mini football, which is a term often used in Europe to describe indoor football. Regardless of the name used, indoor football provides an exciting and fast-paced alternative to traditional football.