High-Level Radioactive Waste (HLRW) is a type of waste that results from the use of nuclear energy and the production of nuclear weapons. It is highly radioactive and generates heat, requiring careful management and storage. HLRW typically comes from spent nuclear fuel and other materials that have been irradiated in nuclear reactors. Due to its dangerous nature, HLRW must be stored in secure facilities designed to contain radiation and prevent environmental contamination. Long-term storage solutions, such as deep geological repositories, are being developed to ensure the safe disposal of HLRW for thousands of years, protecting both people and the environment from its harmful effects.