Nuclear explosives are devices that release energy through nuclear reactions, primarily fission or fusion. Fission occurs when the nucleus of an atom, such as uranium or plutonium, splits into smaller parts, releasing a significant amount of energy. Fusion, on the other hand, involves combining light atomic nuclei, like those of hydrogen, to form a heavier nucleus, also releasing energy. These explosives are used in various applications, including military weapons and scientific research. The most well-known examples are atomic bombs, which utilize fission, and hydrogen bombs, which use fusion. The destructive power of nuclear explosives has significant implications for global security and international relations.