This article describe about Verification and Validation of Computer Simulation Models, where verification is the process of determining that a model implementation and its associated data accurately represent the developer’s conceptual description and specifications. validation is the process of determining the degree to which a simulation model and its associated data are an accurate representation of the real world from the perspective of the intended uses of the model. Simulation models are increasingly being used to solve problems and to aid in decision-making. The developers and users of these models, the decision makers using information obtained from the results of these models.