This document discusses the field of aerodynamics and its application to vehicle design. Aerodynamics is the study of forces generated by air in motion or the motion of objects through air. It can be classified as external or internal, and applies to subsonic, supersonic and hypersonic speeds. Aerodynamics is important for vehicle design including automobiles, ships and bridges to reduce drag, lower fuel consumption, and improve vehicle stability and performance especially at higher speeds. The document outlines the historical development of aerodynamic design of vehicles and methods used to study aerodynamics, including computational modeling and wind tunnel testing.