BWR, or Boiling Water Reactor, is a type of nuclear reactor that generates electricity by using nuclear fission to heat water. In a BWR, water is boiled directly in the reactor core, producing steam that drives a turbine connected to a generator. This process is efficient and allows for a straightforward design. The steam produced in a BWR is then cooled and condensed back into water, which is pumped back into the reactor to be heated again. BWRs are widely used in the United States and other countries due to their reliability and relatively simple operational design.