Enriched uranium is a type of uranium that has a higher concentration of the isotope Uranium-235 compared to natural uranium. Natural uranium contains about 0.7% of Uranium-235, while enriched uranium can have 3% to 5% or more. This process of increasing the concentration is essential for use in nuclear reactors and nuclear weapons. The enrichment process involves separating the isotopes of uranium, which can be done using various methods, such as gas diffusion or centrifugation. Enriched uranium is crucial for generating energy in nuclear power plants and plays a significant role in the field of nuclear technology.