An Atomic bomb rely on fission, or atom-splitting, just as nuclear power plants do. Where as a hydrogen bomb, also called the thermonuclear bomb, uses fusion, or atomic nuclei coming together, to produce explosive energy. Stars also produce energy through fusion.A similar process is going on inside the sun.In theory, the process is potentially infinite. The amount of energy is huge.
The technology of the hydrogen bomb is very sophisticated, and once attained, it is a greater threat. They can be made small enough to fit on a head of an intercontinental missile.
