(NH4)2SO4, known as ammonium sulfate, is a chemical compound composed of two ammonium ions (NH4+) and one sulfate ion (SO4^2-). It appears as a white crystalline solid and is highly soluble in water. Ammonium sulfate is commonly used as a fertilizer in agriculture due to its high nitrogen content, which is essential for plant growth. In addition to its agricultural applications, ammonium sulfate is also utilized in various industrial processes, including the production of certain types of ammonium salts and as a food additive. It can help improve soil quality and is often used in hydroponics to provide essential nutrients to plants.