MMO is a short name of "Massively Multiplayer Online". A MMO game is a multiplayer video game which is able to support a lot of players at the same time. By necessity, they are played on the Internet. There are a few differences between MMOG and other online games. Most MMOGs charge the player a monthly or bimonthly fee to have access to the game's servers, and therefore to online play. There are 61 MMO Games on GaHe.com, and all of them can be played online for free, enjoy!