KNO3, or potassium nitrate, is a chemical compound made up of potassium, nitrogen, and oxygen. It is commonly found in nature as a mineral called niter and is often used in fertilizers to provide essential nutrients for plant growth. KNO3 is also known for its role in food preservation and as a key ingredient in gunpowder. In addition to its agricultural uses, KNO3 has applications in various industries, including the production of glass and ceramics. It can also be used in the manufacture of fireworks and as a cooling agent in certain refrigeration processes. Its versatility makes it an important compound in both science and industry.