Reynolds Averaging is a mathematical technique used in fluid dynamics to analyze turbulent flows. It involves decomposing the flow variables, such as velocity and pressure, into a mean component and a fluctuating component. This helps simplify the complex behavior of turbulent flows by focusing on the average effects over time. By applying Reynolds Averaging, researchers can derive the Reynolds-averaged Navier-Stokes equations, which describe the motion of fluid substances. This approach allows for the prediction of flow patterns and behaviors in various applications, including engineering, meteorology, and environmental science.