MMA, or NHB for No Holds Barred, is a term for the combat sport in which two competitors attempt to achieve dominance over one another by utilizing three general tactics: striking, submission holds and control. The rules allow the combatants to use a variety of martial arts techniques, including punches, kicks, joint-locks, chokes and takedowns. Victory is normally gained through knock-out, submission (one fighter concedes victory to the other by tapping the mat or his opponent with his hand) or referee stoppage.