Niter, also known as saltpeter, is a naturally occurring mineral primarily composed of potassium nitrate. It is often found in arid regions and can form in soil or on the surfaces of rocks. Niter has been historically significant for its use in the production of gunpowder and fertilizers, as it provides essential nutrients for plant growth. In addition to its agricultural applications, niter is also used in the food industry as a preservative and curing agent, particularly in processed meats. Its chemical properties make it valuable in various industrial processes, including the manufacture of explosives and glass.