A nuclear bomb is a powerful weapon that releases energy through nuclear reactions, either fission or fusion. In fission bombs, heavy atomic nuclei, like those of uranium or plutonium, are split apart, releasing a massive amount of energy. Fusion bombs, also known as hydrogen bombs, combine light atomic nuclei, such as hydrogen, to create an even larger explosion. These bombs can cause widespread destruction and loss of life due to their immense explosive power and the resulting radiation. The use of nuclear weapons has significant political and ethical implications, leading to international treaties aimed at preventing their proliferation and promoting disarmament.