U3O8, or uranium oxide, is a chemical compound that contains uranium in a specific oxidation state. It is primarily used as a fuel for nuclear reactors and is a key material in the nuclear energy industry. U3O8 is often found in nature as a mineral and is extracted through mining processes. The compound is typically yellow in color and is commonly referred to as "yellowcake." After extraction, U3O8 undergoes further processing to produce enriched uranium, which is necessary for generating electricity in nuclear power plants. Its significance in energy production makes it a critical component in discussions about nuclear energy and sustainable power sources.