Nuclear waste is the leftover material from nuclear power plants and other facilities that use nuclear energy. This waste can be very dangerous because it contains radioactive substances that can harm people and the environment. There are different types of nuclear waste, including low-level waste, which is less harmful, and high-level waste, which is extremely radioactive and needs special handling. To manage nuclear waste safely, it must be stored in secure facilities, often deep underground. Countries like the United States and France have developed plans for long-term storage to protect future generations from its dangers. Proper disposal is crucial to ensure safety and prevent contamination.