The term "nuclear" refers to anything related to the nucleus, which is the central part of an atom. The nucleus contains protons and neutrons, making it crucial for determining an atom's mass and identity. Protons carry a positive charge, while neutrons are neutral. Together, they form the core of the atom, surrounded by electrons that orbit around the nucleus. Nuclear energy is produced through processes like nuclear fission and fusion. In nuclear fission, the nucleus of an atom, such as uranium, splits into smaller parts, releasing a significant amount of energy. In contrast, nuclear fusion occurs when smaller nuclei, like those of hydrogen, combine to form a larger nucleus, also releasing energy.