Multiplayer online battle arena (MOBA), also known as action real-time strategy (ARTS), is a genre of strategy video games that originated as a subgenre of real-time strategy, in which a player controls a single character in one of two teams. The objective is to destroy the opposing team's main structure with the assistance of periodically spawned computer-controlled units that march forward along set paths. Player characters typically have various abilities and advantages that improve over the course of a game and that contribute to a team's overall strategy. MOBA games are a fusion of action games, role-playing games and real-time strategy games, in which players usually do not construct either buildings or units.