Scramjet stands for "supersonic combustion ramjet" and is a type of jet engine designed for hypersonic flight. It operates on the principle of air entering the engine at supersonic speeds, allowing for efficient combustion of fuel and air at high speeds. Scramjets are primarily used for high-speed aircraft and missiles, where traditional jet engines are not efficient at such speeds. Research in this area focuses on improving the efficiency, stability, and performance of scramjet engines for various applications in the aerospace industry.