Abstract: When the velocity of a vehicle exceeds the speed of sound, a distinctive aerodynamic phenomenon known as a shock wave emerges. As the flow passes through a shock wave, the gas experiences abrupt increases in temperature, density, and pressure, leading to a sharp decline in vehicle performance. These effects become increasingly severe with rising Mach number and once posed significant challenges to aircraft designers. However, with advances in science and technology, researchers have discovered that shock waves, if properly utilized, can be transformed from an adversary into an ally, enabling substantial improvements in vehicle performance. Consequently, the design history of high-speed vehicles can be regarded as an evolutionary process in which humanity has gradually shifted from combating shock waves to cooperating with them. Based on classical aerodynamic theory and representative case studies, this paper provides an accessible explanation of shock-wave phenomena, the potential hazards they may induce, and strategies for their effective utilization.