Simulation is also used when the real system cannot be engaged, because it may not be accessible, or it may be dangerous or unacceptable to engage, or it is being designed but not yet built, or it may simply not exist. Simulation can be used to show the eventual real effects of alternative conditions and courses of action. Simulation is also used with scientific modelling of natural systems or human systems to gain insight into their functioning, as in economics. Simulation is used in many contexts, such as simulation of technology for performance tuning or optimizing, safety engineering, testing, training, education, and video games. ![]() Often, computers are used to execute the simulation. This definition includes time-independent simulations. Another way to distinguish between the terms is to define simulation as experimentation with the help of a model. ![]() Sometimes a clear distinction between the two terms is made, in which simulations require the use of models the model represents the key characteristics or behaviors of the selected system or process, whereas the simulation represents the evolution of the model over time. In this broad sense, simulation can often be used interchangeably with model. A simulation is an imitative representation of a process or system that could exist in the real world.
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