Futsal is an indoor version of soccer that is officially sanctioned
by FIFA. Futsal is played between two teams of five players, one
of whom is the goalkeeper. In addition each team may have a
number of substitutes. Many professional players start out with
futsal to build fundamental skills. Brazilian players Ronaldinho,
Robinho, Ronaldo, Rivaldo and many more started out playing
futsal.
For a complete list of the FIFA Futsal rules please see attached
link below.
FIFA Futsal Rules: http://www.fifa.com/en/regulations/regulation/0,1584,13,00.html