The current practical uses of controlled fission include producing electricity, powering watercraft such as submarines and ships, and powering some spacecraft.
By the process of Nuclear Fission: 1) We Generate Electricity. - If the process is controlled, then we can do this. It's very better way to generate electricity. 'cause of it's many advantages, all nation wants to enhance their electricity production through this mean.
2) We Create explosive. - Again, with the help of nuclear fission we can create certain helpful bombs like Atom Bomb which will help us in war.