Aerodynamic efficiency refers to how well an object or vehicle is able to move through air with minimal resistance. This means that it can travel smoothly and quickly without experiencing any drag, which would slow down its movement. The more aerodynamic efficient a design is, the less energy it will require to maintain its speed, making it more fuel-efficient in the case of vehicles or cost-effective for businesses operating aircrafts. In essence, aerodynamic efficiency is about optimizing shape and materials to reduce air resistance and improve performance.