Computer models are digital representations of real-world systems or processes. They use mathematical equations and algorithms to simulate how these systems behave under different conditions. For example, a weather model can predict future weather patterns by analyzing data from various sources, such as temperature and humidity. These models are valuable tools in many fields, including engineering, economics, and environmental science. By running simulations, researchers can test hypotheses, make predictions, and explore scenarios without the risks or costs associated with real-life experiments. This helps in making informed decisions and understanding complex systems better.