The Berlin Wall was a physical barrier built by the German Democratic Republic during the Cold War, which surrounded all of West Berlin, separating it from East Germany, including East Berlin.
This wall, in addition to dividing the city of Berlin in half, symbolized the division of the world into two blocks or parts: Federal Republic of Germany (RFA), which was constituted by the capitalist countries headed by the United States; and the German Democratic Republic (RDA), constituted by the socialist countries under yoke of the Soviet regime.