You can learn more about nuclear fusion by visiting other locations on the Internet. Nuclear fission means splitting an atom apart. Splitting an atom releases heat and light energy. In a nuclear power plant, an atomic chain reaction is controlled to produce heat to boil water. That water boils water in pipes to make steam to turn a turbine and a generator to make electricity.
Nuclear fusion means combines atomic nuclei to make a larger nucleus.
The sun uses nuclear fusion of hydrogen into helium to make light and heat energy. Scientists are trying to create nuclear fusion to make a cleaner source of power.