Topic summary
MMOG

Extracted from the Wikipedia article Massively multiplayer online game.
A massively multiplayer online (MMO) game, abbreviated as MMOG or MMO, is a type of online video game that allows a large number of players to simultaneously interact in the same game server. MMOs often feature a huge and persistentopen world, although there are games that differ. These games can be played on most network-capable platforms, including the personal computer, video game console, or smartphones and other mobile devices.