Massively Multiplayer#
Huge number of players on a single instance (200-1000)
Game instance is long-lived (24h/7)
Map/Level is big (levels are streamed seamlessly)
Latency is not too critical (100-200ms)
PvP will prefer lower latency
PvE is manageable with higer latency
Note
MMO will often provide competitive sub-games (battleground) which will have different requirements.