Question

what is nuclear fusion reaction​

Answer 1

$\huge\mathfrak{hlo \: mate}$

a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.

Answer 2

The best examples of the nuclear fusion is the energy of our sun. The sun is composed of lots of hydrogen and by the fusion of two isotopes of the hydrogen, helium is produced and in turn energy is released.