Nuclear energy is the energy stored in the nuclei of atoms, which is released when these nuclei disintregrate.
A nuclear power station is a type of thermal power station in which, instead of fossil fuels, they use uranium-235, an isotope of the element uranium which breaks down into the nuclei of smaller atoms and releases a large quantity of energy (according to Einstein's equation E = mc²), that is used to heat water which, converted into steam, moves the turbines connected to a generator that produces electricity.
The nuclear chain reactions of fission take place in the nuclear reactors, which are the equivalent of the boiler in a thermal power station using fossil fuels.

Advantages: small quantities of fuel produce a great deal of energy and there are abundant reserves of nuclear material.

Disadvantages: nuclear power stations generate waste which is very difficult to eliminate. The danger presented by radioactivity makes necessary the adoption of safety measures which are very expensive.