(online gaming) A computer game in which a large number of players can simultaneously interact in a persistent world.

A multiplayer video game is a video game in which more than one person can play in the same game environment at the same time, either locally on the same computing system (couch co-op), on different computing systems via a local area network, or via a wide area network, most commonly the Internet (e.g. World of Warcraft, Call of Duty, DayZ).

An online computer role-playing game in which a large number of players can interact with one another.

Massively multiplayer online real-time strategy game mixes the genres of real-time strategy and massively multiplayer online games, possibly in the form of web browser-based games, in which a very large number of players interact with one another within a virtual world.