There are three types of officials in badminton: line judges, who judge all line calls during a match; umpires, who are the head official during a particular match; and referees, who oversee all judgments made on the court during a tournament and to whom the umpires and line judges directly report. Referees also set the schedule of play and practices as well as the condition of the courts.
Badminton is a sport that is a cross between tennis and volleyball. The players, either one or two per side, play with a racket and hit a shuttlecock with the racket over a raised net to a player on the other side. Badminton has been played as an Olympic sport since 1992.