Simulation-based training has become a vital part of modern anesthesia and operation theatre education, offering a safe setting to build clinical skills without risking patient safety. This review explores current uses, clinical benefits, and challenges of simulation in anesthesia and OT training, with a focus on its importance for anesthesiologists and OT technologists. From basic task trainers to advanced simulators, virtual and augmented reality, AI-assisted tools, and in-situ simulations are increasingly adopted in healthcare training. In anesthesia, simulation supports repeated practice of airway management, CPR, regional anesthesia, equipment handling, and crisis management. In the OT, it educates on sterile techniques, infection control, instrument handling, emergency response, teamwork, communication, and interdisciplinary crisis management. Evidence indicates that simulation enhances both technical and non-technical skills, such as procedural competence, confidence, teamwork, crisis decision-making, and readiness for high-stakes scenarios. For technologists, it provides important opportunities to develop skills in setting up anesthesia workstations, managing airway and emergency equipment, monitoring, organizing instruments, troubleshooting during surgery, and collaborating across disciplines. However, barriers such as high costs, limited access, shortage of trained faculty, technical issues, lack of standardized curricula and assessments, and logistical hurdles hamper implementation. Therefore, simulation should complement, not replace, supervised clinical training. Anticipated future advancements with AI, immersive VR/AR, telesimulation, competency evaluation, and affordable models will likely broaden its educational and safety benefits. Overall, simulation-based training is a powerful method to enhance clinical skills, teamwork, patient safety, and ongoing professional development in anesthesia and OT practice.