Nuclear fusion reactions are a type of nuclear reaction where atomic nuclei combine to form heavier nuclei, releasing a significant amount of energy in the process. There are several synonyms for nuclear fusion reactions, some of which include thermonuclear reactions, fusion processes, fusion reactions, and fusion energy. These reactions are vital in powering the sun and other stars and hold enormous potential as a clean, virtually limitless source of energy. With the increasing demand for renewable energy solutions, research into nuclear fusion reactions has intensified in recent years, with many governments and organizations investing in developing and commercializing this technology.