>>11367951First of all, don't start studying Fusion because the answers will never be clear up front. Start by reading about how general chemical reactions work, then nuclear chemistry which leads to Fission.
In short: for most chemical reactions, you need to add energy to break bonds and change the composition of each ingredient. The most common energy-adding device is a bunsen burner. In an automobile engine, which is a sort of chemical explosion engine, this energy is supplied by a spark plug.
The same happens in an atomic bomb: many spark plugs, timed perfectly, compress some U-235 in such a manner where each atom's bonds break and rapidly expand outward, causing an explosion aka Fission. In the 1950s this processed was improved where the sparkplugs could "boost" themselves by using electromagnetic force to cause a very small non-self-sustaining fusion reaction, wherein some atoms totally disassemble into other materials. Such an event could get a much hotter, and thus more efficient, compression which ultimately led to H-bombs.
Fusion is just taking that idea and harnessing it in a manner useful to commercial energy. In theory the act of disassembling atoms and reassembling them at a lower energy level would yield a massive, and (unlike nuclear bombs) controllable stream of energy. The main issue is containing this act, which is very difficult because it happens at the same temperature the sun does. This is what causes Fusor reactors most notable parts, namely the electromagnetic suspension of gas, to be used to try and contain it. So far attempts have been unsuccessful.
