Here's a breakdown:

* Nuclear fusion is a process where two or more atomic nuclei combine to form one or more different atomic nuclei and subatomic particles (neutrons or protons). This process releases a tremendous amount of energy.

* The most well-known example of nuclear fusion is the process that powers stars, where hydrogen nuclei fuse to form helium, releasing immense amounts of energy in the form of light and heat.

Let me know if you have any other questions!