CeO2, or cerium dioxide, is a chemical compound made up of cerium and oxygen. It is a white, odorless powder that is commonly used as a catalyst in various chemical reactions, particularly in automotive catalytic converters to reduce harmful emissions. Additionally, it serves as an important material in the production of glass and ceramics, enhancing their durability and optical properties. This compound is also utilized in the field of electronics, where it acts as a polishing agent for semiconductor wafers. Due to its unique properties, CeO2 has applications in energy storage and conversion technologies, making it a valuable material in modern industries.