Nuclear energy is a form of energy that is generated by the splitting or fusing of atoms. This type of energy has been used for many purposes, including electricity generation, medical applications, and military applications. Nuclear energy can be generated in several different ways, including through nuclear fission and nuclear fusion. Nuclear fission involves splitting an atom's nucleus into two or more smaller nuclei, while nuclear fusion involves combining two or more nuclei to form a larger nucleus. Both processes release large amounts of energy in the form of heat and radiation.