Molybdenum trioxide is a chemical compound with the formula MoO3. It appears as a yellowish or white powder and is primarily used in various industrial applications, including the production of molybdenum metal and as a catalyst in chemical reactions. This compound is also important in the manufacture of glass and ceramics, where it helps improve durability and color. Additionally, molybdenum trioxide can be utilized in electronics and as a pigment in paints, showcasing its versatility across different fields.