MgSO4·8H2O, commonly known as magnesium sulfate octahydrate, is a chemical compound composed of magnesium, sulfur, and oxygen, along with eight water molecules. It appears as a white crystalline solid and is often found in nature as the mineral epsomite. This compound is soluble in water and is used in various applications, including agriculture and medicine. In agriculture, MgSO4·8H2O serves as a fertilizer, providing essential magnesium and sulfur nutrients to plants. In medicine, it is used in treatments for conditions like eclampsia and as a laxative. Its versatility makes it an important compound in both fields.