The type of energy stored in the nucleus of an atom is known as nuclear energy. This form of energy is released during nuclear reactions, such as fission—the splitting of an atomic nucleus—or fusion—the merging of nuclei. In nuclear reactors, fission produces vast amounts of energy used for electricity generation. The strong nuclear forces binding protons and neutrons in the nucleus govern this energy. Understanding nuclear energy is critical for harnessing it for power and comprehending both the benefits and risks associated with nuclear technology.