The lifecycle of a simulation study is described along with an example. In addition, the advantages and limitations of simulation are discussed. Science and engineering are based on three pillars: observation, experimentation, and computation. The reason is that there is still oxygen inside the glass cup which will eventually be used up by the flame. A computation is a representation of the phenomenon or system under study in the form of a computer program. Simulation is the process of representing a system by a model and then executing this model to generate raw data. The raw data is also referred to as simulation data. It is synthetic because it is not actual data. The outcome of this phase is a mental image of the system and its operation. For mathematical equations, there are tools like calculus and queueing theory that can be used to obtain closed-form solutions.