Simulation is the artificial representation of a real-world process with sufficient fidelity in order to facilitate learning through immersion, reflection, feedback and practice without the risks inherent in a similar real-life experience. Simulation in medical education has come a long way from the basic task trainers used for the rehearsal of basic skills to the high fidelity human patient simulators. Both advantages and disadvantages have been identified for simulation based medical education. This article based on literature search reiews the pros and cons of simulation in medical education. Before we incorporate simulation further in medical curriculum, more evidence on its utility is needed in the form of studies that assess the impact of simulation training on patient outcome.