The term "chain reactors" refers to devices or systems that use nuclear fission to generate power. Synonyms for this term include "nuclear reactors," "atomic reactors," and "thermal reactors." These reactors work by using controlled nuclear reactions to heat water, producing steam to turn a turbine and generate electricity. Other synonyms for chain reactors may include "nuclear power plants," "nuclear generators," or "nuclear energy facilities." While nuclear power can be controversial due to the potential for radiation leaks, it remains an important source of energy worldwide, providing a steady, reliable source of electricity in many countries.