Mixed Martial Arts (MMA) is a full-contact combat sport that allows both striking and grappling, both standing and on ground, using techniques from other combat sports and martial arts.
Victory in a match is normally gained either by the judges' decision after an allotted amount of time has elapsed, a stoppage by the referee or the fight doctor, a submission, by a competitor's cornerman throwing in the towel, or by knockout.
Knockout (KO): as soon as the fighter is unable to continue due to legal strikes, their opponent is declared the winner. As MMA allows submissions and ground and pound, the fight is stopped to prevent further injury to the fighter. Submission; a fighter may admit defeat during a match either by verbal submission or a tap on the opponent's body or mat/floor.
Technical Submission: the referee stops the match when the fighter is caught in a submission hold and is in danger of being injured. Often it is when a fighter gets choked unconscious; other times it is when a bone has been broken in a submission hold.
Technical Knockout (TKO) and a referee may stop a match in progress if: a fighter becomes dominant to the point where the opponent can not intelligently defend themselves and is taking excessive damage as a result, a fighter appears to be a losing consciousness as he/she is being stuck or a fighter to have a significant injury such as a cut or broken bone.