Simulation is the process of designing a model of a real system and conducting experiments on the model to understand the behavior of the system. The key steps in simulation include formulating the problem, introducing important variables and decision rules, constructing a simulation model, validating the model, designing experiments, performing the simulation, determining if the simulation problem is complete, and selecting the best course of action. Simulation is useful for solving complex problems, experimenting, studying long-term effects, validating analytical solutions, assessing stability, generating data, saving time, and as a last resort approach. Monte Carlo simulation and simulation applications in business, inventory control, and financial decision making are discussed. An example problem on generating a 10-day demand sequence using a given