The Soviet Bloc refers to a group of socialist states in Central and Eastern Europe that were under the influence or direct control of the Soviet Union during the Cold War. These countries, including Poland, East Germany, Czechoslovakia, Hungary, Romania, and Bulgaria, were characterized by one-party rule and centralized economic planning. The Soviet Bloc played a crucial role in the geopolitical tensions of the Cold War and ultimately contributed to its end as these nations moved towards reform and democratization.