The NATO-Warsaw Pact refers to two opposing military alliances formed during the Cold War. NATO, or the North Atlantic Treaty Organization, was established in 1949 by Western countries to provide collective defense against potential aggression from the Soviet Union, while the Warsaw Pact, created in 1955, was a response from the Soviet Union and its Eastern Bloc allies, solidifying their military cooperation. This division symbolized the geopolitical tension of the era and highlighted the ideological conflict between Western capitalism and Eastern communism.