Weapons of Mass Destruction, or WMDs, refer to a category of weapons that can cause significant harm to a large number of people and the environment. This category includes nuclear weapons, chemical weapons, and biological weapons. WMDs are designed to inflict mass casualties and destruction, making them a major concern for global security. The use and proliferation of WMDs are heavily regulated by international treaties, such as the Nuclear Non-Proliferation Treaty (NPT) and the Chemical Weapons Convention (CWC). These agreements aim to prevent the spread of such weapons and promote disarmament, ensuring that nations work together to reduce the threat they pose.