Boiling water reactors (BWRs) are a type of nuclear reactor that generates electricity by using nuclear fission to heat water. In a BWR, water is both the coolant and the moderator, meaning it helps slow down neutrons to sustain the fission reaction. The heated water turns into steam, which drives a turbine connected to a generator, producing electricity. BWRs operate at lower pressure compared to other reactor types, allowing the water to boil directly in the reactor core. This design simplifies the system, as the steam produced can be sent directly to the turbine. BWRs are widely used in the United States and other countries for commercial power generation.