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A vast area which includes generating results from computer models.

Simulation is the imitation of the operation of a real-world process or system over time. The act of simulating something first requires that a model be developed; this model represents the key characteristics or behaviors/functions of the selected physical or abstract system or process. The model represents the system itself, whereas the simulation represents the operation of the system over time

(source: Wikipedia)

For understanding when to use simulation, refer to the following question:

When to use simulations?

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