A simulation is an approximate imitation of the operation of a process or system that represents its operation over time.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, computer experiments are used to study simulation models. Simulation is also used with scientific modelling of natural systems or human systems to gain insight into their functioning, as in economics. Simulation can be used to show the eventual real effects of alternative conditions and courses of action. 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.Key issues in simulation include the acquisition of valid sources of information about the relevant selection of key characteristics and behaviors, the use of simplifying approximations and assumptions within the simulation, and fidelity and validity of the simulation outcomes. Procedures and protocols for model verification and validation are an ongoing field of academic study, refinement, research and development in simulations technology or practice, particularly in the work of computer simulation.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.Simulation methods are ways to imitate of the operation of real-world systems. ... When the computer program is run, the resulting mathematical dynamics form an analog of the behavior of the real system, with the results presented in the form of data lists or images representing predicted outcomes.The uses of simulation in business are varied and it is often utilized when conducting experiments on a real system is impossible or impractical, often because of cost or time. ... By being able to inspect processes and interact with a simulation model in action, both understanding and trust are quickly built.Main advantages of simulation include: Study the behavior of a system without building it. Results are accurate in general, compared to analytical model. Help to find un-expected phenomenon, behavior of the system.It is, essentially, a program that allows the user to observe an operation through simulation without actually performing that operation. Simulation software is used widely to design equipment so that the final product will be as close to design specs as possible without expensive in process modification.“If we are living in a simulation, then the cosmos that we are observing is just a tiny piece of the totality of physical existence,” Oxford philosopher Nick Bostrom said in a 2003 paper that jump-started the conversation about what has come to be known as the simulation hypothesis