There are a number of factors shared by most MMOGs that make them different from other types of computer
GAMES. MMOGs create a persistent universe where the
game continues playing regardless of whether or not anyone else is. Since these
GAMES strongly or exclusively emphasize multiplayer
gameplay, few of them have any significant single-player aspects or client-side artificial intelligence. As a result, players cannot "finish" MMOGs in the typical sense of single-player
GAMES.