Nuclear fission and fusion are two processes that involve the splitting or combining of atomic nuclei. NUCLEAR fission is the process of splitting a nucleus into two or more smaller nuclei, while NUCLEAR fusion is the process of combining two or more nuclei to form a larger nucleus. Both processes release large amounts of energy, which can be used for various applications such as electricity generation and propulsion. NUCLEAR fission and fusion are both important components of NUCLEAR power plants, which use the energy released from these processes to generate electricity.