A massively multiplayer online game (also called MMO and MMOG) is a multiplayer video game which is capable of supporting large numbers of players simultaneously. By necessity, they are played on the Internet. MMOs usually have at least one persistent world, however some games differ. These games can be found for most network-capable platforms, including the personal computer, video game console, or smartphones and other mobile devices.
More at: Massively multiplayer online game
More at: massively multiplayer online game