Pressurized Water Reactors (PWR) are a type of nuclear reactor that uses water as both a coolant and a neutron moderator. In a PWR, water is kept under high pressure to prevent it from boiling, allowing it to reach high temperatures. This heated water is then circulated through a heat exchanger, where it transfers its heat to a secondary water system, producing steam. The steam generated in the secondary system drives turbines to produce electricity. PWRs are widely used in commercial nuclear power plants due to their reliability and safety features. They are one of the most common reactor designs in the world, contributing significantly to global energy production.