This document discusses simulation in healthcare, specifically in anesthesia. It defines simulation as artificially replicating aspects of the real world to achieve educational goals. Simulation has various uses including training technical and non-technical skills, testing equipment and protocols, and assessing performance. In anesthesia, simulation is important for learning rare and emergency skills without risking patients. It also allows training in non-technical skills like communication and teamwork. The document outlines the history and types of medical simulators, how simulation can improve safety, and its role in research. In situ simulation conducted in actual clinical spaces is highlighted as a way to identify real-world issues.