Diku is a type of text-based online game known as a MUD (Multi-User Dungeon). It originated in the early 1990s at the University of Copenhagen, Denmark. Players explore a fantasy world, interact with each other, and engage in quests, battles, and character development. The game is known for its rich storytelling and collaborative gameplay. The name Diku comes from the original game, DikuMUD, which served as a foundation for many other MUDs and inspired the development of various multiplayer online role-playing games (MMORPGs). Its influence can be seen in games that emphasize community and shared experiences in virtual environments.