Ferrous oxide, also known as iron(II) oxide or iron oxide, is a chemical compound made up of iron and oxygen. It has the formula FeO and is typically found in a black powder form. This compound is important in various industrial applications, including the production of iron and steel, as well as in ceramics and pigments. Ferrous oxide can react with oxygen to form ferric oxide, or iron(III) oxide, which is commonly known as rust. It is also used in the manufacturing of certain types of glass and as a catalyst in chemical reactions. Understanding ferrous oxide is essential for industries that rely on iron and its compounds.