Uranium concentrate, often referred to as yellowcake, is a powdered form of uranium oxide produced from the milling of uranium ore. This process involves crushing the ore and using chemicals to extract the uranium, resulting in a concentrated product that typically contains about 70-90% uranium. This concentrate is an essential step in the nuclear fuel cycle, as it is further processed to produce uranium fuel for nuclear reactors. The conversion and enrichment processes that follow are necessary to increase the concentration of the fissile isotope Uranium-235 for use in energy production.