Hydrogen Bomb  

A hydrogen bomb, also known as a thermonuclear weapon or H-bomb, is a nuclear weapon that uses nuclear fusion to create an explosion, making it significantly more powerful than an atomic bomb. It achieves this by triggering a chain reaction of nuclear fusion, where light atomic nuclei combine to form heavier nuclei, releasing tremendous energy.  Hydrogen bomb makes use of both nuclear fussion and fission, while fission occur first to give a desire temperature for fussion process,        

Atomic Bomb 

      Atomic bomb is a weapon with great explosive power that results from the sudden release of energy upon the splitting, or fission, of the nuclei of a heavy element such as plutonium or uranium. Atomic bomb makes use of fission process.     

Nuclear Reaction

What are Nuclear Reactions?

Nuclear reactions are processes in which one or more nuclides are produced from the collisions between two atomic nuclei or one atomic nucleus and a subatomic particle. The nuclides produced from nuclear reactions are different from the reacting nuclei (commonly referred to as the parent nuclei). Two notable types of nuclear reactions are nuclear fission reactions and nuclear fusion reactions. The former involves the absorption of neutrons (or other relatively light particles) by a heavy nucleus, which causes it to split into two (or more) lighter nuclei. Nuclear fusion reactions are the processes in which two relatively light nuclei combine (via a collision) to afford a single, heavier nucleus.