Nuclear warfare refers to the use of nuclear weapons to inflict damage during armed conflict. These weapons release enormous amounts of energy through nuclear reactions, resulting in devastating explosions and widespread destruction. The effects of nuclear warfare can lead to significant loss of life, long-term environmental damage, and severe health issues for survivors. Countries that possess nuclear weapons, such as the United States and Russia, maintain them as a deterrent against potential attacks. The threat of nuclear warfare has led to various international treaties aimed at controlling the proliferation of these weapons, such as the Nuclear Non-Proliferation Treaty (NPT).