A very brief introduction to gun, rocket and gas generating propellants is presented. For gun propellants single, double, and triple-based compositions are described together with composite, liquid and high energy gun propellants. For rocket propellants details of liquid, composite, double-based compositions and green propellants are given. The second part of this chapter briefly introduces heat, smoke, light and noise generating pyrotechnics together with pyrotechnic delay compositions. Pyrotechnic countermeasures are briefly introduced.