Magnesium oxide, or MgO, is a white, powdery compound made from magnesium and oxygen. It is commonly used in various industries, including construction and agriculture. In construction, MgO is valued for its fire-resistant properties and is often used in making cement and insulation materials. In addition to its industrial uses, MgO plays a role in health and nutrition. It can be found in dietary supplements, helping to support bone health and muscle function. Overall, MgO is a versatile compound with important applications in both everyday life and specialized fields.