The German Democratic Republic was the official name of East Germany, which existed as a separate state between 1949 and 1990. During this period, several synonyms were used to refer to the country, including GDR, DDR, and East Germany. The GDR and DDR are both acronyms derived from the German name of the country, while East Germany is a descriptive term that refers to its location in relation to West Germany, its main rival state. Other less common synonyms for the GDR include the Soviet Zone of Occupation, Deutsche Demokratische Republik, and German Democratic Republic of the Soviet Union.