A nuclear warhead is a type of explosive device that derives its destructive power from nuclear reactions, either fission or fusion. These warheads are designed to be delivered by various means, such as missiles or aircraft, and can cause massive destruction over a wide area. The energy released from a nuclear explosion can result in significant loss of life and long-term environmental damage. Nuclear warheads are a key component of many countries' military arsenals, often associated with deterrence strategies during conflicts. The existence of these weapons has led to international treaties aimed at controlling their proliferation, such as the Nuclear Non-Proliferation Treaty (NPT), which seeks to prevent the spread of nuclear weapons and promote peaceful uses of nuclear energy.