Well, RPG is role playing game - the player takes a role of a character then speaks to people, developes abilities, battles monsters and so on. The A RPG stands for Action Role Playing Game. The difference between RPGs and ARPGs is the focus of the game. While in RPGs the main focus is storytelling and the choices the player makes to infuence the story, in ARPGs the focus is on the combat. Action RPGs tend to have better or at least different combat systems than the usual rpgs. The ARPGs battles usually depend on player's reflexes as well as on their character developement and tactical skills. In MMORPGs there is really hardly to say if there are any games with an usual RPG battle systems. When they talk about Action MMORPGs they are usually refering to games that have mixed First Person or Third Person Shooter elements with the RPG elements of the game.