External aerodynamics is a specialized domain within fluid dynamics and aerodynamics that studies the interaction between external airflow and the surfaces of solid objects. It investigates the forces (lift, drag, side force) and moments generated on these objects due to their relative motion through the air or exposure to airflow, alongside the complex flow phenomena (e.g., boundary layers, separation, turbulence) surrounding them. This field is critical for the design, analysis, and performance optimization of vehicles and structures operating within or exposed to atmospheric flow, impacting efficiency, stability, control, and structural integrity.