<b>Nuclear Fusion Reactor – A Review Study</b> This paper aims to explode nuclear fusion reaction, the theory behind nuclear fusion reactors and countries with different types of fusion reactors along with their fusion theory involved. The energy generated from nuclear fusion reaction is much more huge as compared to nuclear fission reaction, so there have been many research going on this field to explode efficient way to extract this energy into electricity through fusion reactors. The advantages of nuclear fusion over fission is also been discussed and why do we need nuclear fusion energy. Nuclear fusion reactors are key to future energy. Future energy, MCT, ICF, Fusion reactor, Fission reaction, ITER, DEMO 690-695 Issue-3 Volume-4 Avinash Kumar Mishra | Dr. Anitha G. S.