National Nuclear Security refers to the measures and policies implemented by a country to protect its nuclear materials and facilities from theft, sabotage, or unauthorized use. This includes securing nuclear weapons, ensuring the safety of nuclear power plants, and preventing the proliferation of nuclear technology to hostile entities. Governments often collaborate with international organizations, such as the International Atomic Energy Agency (IAEA), to enhance global nuclear security. This cooperation involves sharing best practices, conducting inspections, and providing technical assistance to ensure that nuclear materials are used safely and responsibly, thereby reducing the risk of nuclear terrorism and accidents.