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Definition of computation. 1  1a : the act or action of computing : calculationb : the use or operation of a computer. 2  2 : a system of reckoning. 3  3 : an amount computed.
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. Simulation is used in many contexts, such as simulation of technology for performance optimization, safety engineering, testing, training, education, and video games.