Nuclear interactions refer to the forces that hold the particles within an atomic nucleus together. These interactions primarily involve protons and neutrons, which are collectively known as nucleons. The strong nuclear force is the key player here, overcoming the repulsive electromagnetic force between positively charged protons to keep the nucleus stable. When nuclei interact, they can undergo processes like fusion or fission. In nuclear fusion, lighter nuclei combine to form a heavier nucleus, releasing energy, as seen in the sun. Conversely, in nuclear fission, a heavy nucleus splits into smaller nuclei, also releasing energy, which is harnessed in nuclear power plants.