A simulation may refer to any of the following:
1. In general, sim or simulation refers to a computerized imitation of a real object or real action.
2. Short for flight simulation, this type of sim simulates real world flying.
3. A sim is a shortened version of a SIM card.
4. Sim is the prefix of a series of games developed by Maxis or EA which enables the player to simulate another life or other environment. Some examples are The Sims, Sim Ant, Sim Tower, and Sim Isle.