Computer simulations are digital models that replicate real-world processes or systems. They use mathematical algorithms to mimic the behavior of various phenomena, allowing researchers and engineers to study complex scenarios without the need for physical experiments. This approach is widely used in fields like climate science, engineering, and medicine. These simulations can help predict outcomes, test theories, and visualize data in a controlled environment. By adjusting variables within the simulation, users can explore different scenarios and understand potential impacts, making them valuable tools for decision-making and problem-solving in various industries.