Hypersonic vehicles are aircraft or missiles that can travel at speeds greater than five times the speed of sound, or Mach 5. These vehicles are designed to operate in the atmosphere and can reach altitudes where traditional aircraft cannot. Their advanced technology allows for rapid travel, making them of interest for both military and civilian applications. The development of hypersonic vehicles involves complex engineering and materials science to withstand extreme temperatures and pressures. Countries like the United States, China, and Russia are actively researching and testing these vehicles, aiming to enhance their defense capabilities and improve global transportation systems.