Computational Fluid Dynamics (CFD) is a branch of fluid mechanics that uses numerical analysis and algorithms to solve and analyze problems involving fluid flows. By applying mathematical equations, CFD simulates how fluids interact with surfaces and other fluids, allowing engineers and scientists to predict behaviors in various scenarios, such as airflow over an aircraft wing or water flow in a pipe. CFD is widely used in industries like aerospace, automotive, and civil engineering. It helps in optimizing designs, improving efficiency, and ensuring safety by visualizing complex fluid behaviors that would be difficult or impossible to observe in real life.