Aerodynamic efficiency refers to how effectively an object moves through a fluid, typically air. It is a measure of how much lift is generated compared to the drag force acting against the object. Higher aerodynamic efficiency means that an object can travel faster or farther with less energy, making it crucial in fields like aviation and automotive design. Factors influencing aerodynamic efficiency include shape, surface texture, and speed. For example, aircraft are designed with streamlined shapes to minimize drag, while race cars often feature aerodynamic components like spoilers to enhance performance. Understanding these principles helps engineers create more efficient vehicles.