NH4ClO4, or ammonium perchlorate, is a chemical compound composed of ammonium ions (NH4+) and perchlorate ions (ClO4-). It is a white, crystalline solid that is highly soluble in water. This compound is commonly used as an oxidizer in solid rocket propellants, where it helps to provide the necessary oxygen for combustion. In addition to its use in rocketry, NH4ClO4 has applications in pyrotechnics and explosives. It is valued for its stability and efficiency in producing thrust. However, due to its oxidizing properties, it must be handled with care to prevent unintended reactions.