ANSYS CFD, or ANSYS Computational Fluid Dynamics, is a specialized software module within the ANSYS suite that focuses on simulating and analyzing fluid flow and heat transfer in engineering and design applications. Computational Fluid Dynamics (CFD) is a branch of fluid mechanics that uses numerical methods and algorithms to solve and analyze problems involving fluid flows. ANSYS CFD is widely used in various industries to simulate and optimize the behavior of fluids in different systems.