Explanation – Scramjets (Supersonic Combustion Ramjets) are a type of air-breathing engine. They rely on atmospheric oxygen for combustion, eliminating the need to carry onboard oxidizers, which makes them more efficient for certain high-speed applications. Scramjets operate efficiently at hypersonic speeds (greater than Mach 5) and use supersonic airflow for combustion, unlike traditional jet engines or rockets.

Source: The Hindu