The BrahMos is a medium-range ramjet supersonic cruise missile that can be launched from submarines, ships, fighter aircraft or TEL. It is a joint venture between the Indian Defence Research and Development Organisation (DRDO) and the Russian Federation's NPO Mashinostroyeniya, who together have formed BrahMos Aerospace. The missile is based on P-800 Oniks. The name BrahMos is a portmanteau formed from the names of two rivers, the Brahmaputra of India and the Moskva of Russia.

A ramjet is a form of airbreathing jet engine that requires forward motion of the engine to provide air for combustion. Ramjets work most efficiently at supersonic speeds around Mach 3 and can operate up to Mach 6.