MUD (Multi-User Dungeon or Dimension)- A (usually text-based) multi-user simulation environment. Some are purely for fun and flirting, others are used for serious software development, or education purposes and all that lies in between. A significant feature of most MUDs is that users can create things that stay after they leave and which other users can interact with in their absence, thus allowing a “world” to be built gradually and collectively. See also: MOO

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