Referee

A referee or simply ref is the person of authority in a variety of sports who is responsible for presiding over the game from a neutral point of view and making on-the-fly decisions that enforce the rules of the sport, including sportsmanship decisions such as ejection. The official tasked with this job may be known, in addition to referee, by a variety of other titles as well (often depending on the sport), including official, umpire, judge, arbiter, arbitrator, linesman, commissaire, timekeeper, touch judge or Technical Official(by the International Olympic Committee).