MMORPG is an abbreviation used for "Massively Multiplayer Online Role-Playing Game." MMORPGs are a genre of computer role-playing games (CRPGs) in which a large number of players interact with one another within a virtual game world. MMORPGs are distinguished from single-player or small multi-player CRPGs by the number of players, and by the game's persistent world, usually hosted by the game's publisher, which continues to exist and evolve while the player is away from the game. MMORPGs are very popular throughout the world, with players from many nations. Several common themes are found in most MMORPGs: social interaction within the game, in-game culture, and character customization. Sherwood Dungeon is a good example of a typical MMORPG.