What is nuclear fusion?

Nuclear fusion is a process by which two atomic nuclei combine to form a single, heavier nucleus, releasing vast amounts of energy in the process. This process is the fundamental source of energy for stars, including our Sun, and has the potential to provide a nearly limitless, clean energy source for humanity. Understanding nuclear fusion requires exploring its physical principles, the history of its discovery, the conditions under which it occurs, its applications, and the challenges involved in harnessing it for practical use.