Read the general information about the aoc, its developers, the Conan license, and the release plans. What is an MMORPG? MMORPG (usually shortened to MMO) is an acronym for Massively Multiplayer Online Roleplaying Game. These are games played via the Internet and involving hundreds or thousands of players all playing on the same server or gameworld. Players can meet each other in-game, play together, and adventure with thousands of people from around the world.