The Nuclear Security Administration (NSA) is a part of the U.S. Department of Energy responsible for ensuring the safety and security of the nation's nuclear weapons. It oversees the management of nuclear materials and facilities, working to prevent nuclear terrorism and proliferation. The NSA also conducts research and development to maintain the effectiveness of the nuclear stockpile without nuclear testing. In addition to its focus on weapons security, the NSA plays a role in promoting international nuclear security standards. It collaborates with other countries and organizations to enhance global efforts in preventing the spread of nuclear weapons and ensuring the safe handling of nuclear materials.