Nuclear fission is a reaction in which a heavy nucleus undergoes neutron bombardment and subsequently becomes unstable. As a result, it splits into two nuclei of equal mass, with a significant loss of energy and the emission of two or three neutrons.
Electricity can be produced using nuclear energy, but it first needs to be released from the atom. Atoms are divided during nuclear fission in order to unleash that energy.
A collection of devices that can manage nuclear fission to generate electricity is known as a nuclear reactor or power plant.