Hypersonic propulsion is a specialized field of aerospace engineering and physics dedicated to the study, design, and implementation of propulsion systems capable of operating effectively at speeds exceeding Mach 5. It investigates the complex fluid dynamics, thermodynamics, and chemical reaction kinetics inherent to generating thrust within the hypersonic flight regime, requiring novel approaches to engine cycles, thermal management, and materials science. The development of hypersonic propulsion is significant for enabling ultra-high-speed atmospheric flight, rapid global access, and advanced aerospace system performance.