Simulations are models or representations of real-world processes or systems that allow people to study and analyze their behavior without the risks or costs associated with actual events. They can be used in various fields, such as education, engineering, and medicine, to help individuals understand complex concepts or practice skills in a controlled environment. In a simulation, users can manipulate variables and observe outcomes, making it a valuable tool for training and experimentation. For example, flight simulators enable pilots to practice flying without leaving the ground, while computer simulations can model climate change effects to inform policy decisions.