Weapon proliferation refers to the spread of weapons, particularly advanced military technology, among countries and non-state actors. This includes the distribution of conventional arms, such as firearms and missiles, as well as weapons of mass destruction (WMD), like nuclear, chemical, and biological weapons. The concern is that increased access to these weapons can lead to conflicts and instability. Efforts to control weapon proliferation involve international treaties and agreements, such as the Nuclear Non-Proliferation Treaty (NPT) and the Arms Trade Treaty (ATT). These agreements aim to limit the development, transfer, and stockpiling of dangerous weapons, promoting global security and reducing the risk of armed conflict.