During the later stages of World War II and the post-war period, Germans and Volksdeutsche fled and were expelled from various Eastern and Central European countries, including Czechoslovakia, and from the former German provinces of Lower and Upper Silesia, East Prussia, and the eastern parts of Brandenburg (Neumark) and Pomerania (Hinterpommern), which were annexed by Poland and the Soviet Union.

In Nazi German terminology, Volksdeutsche were "people whose language and culture had German origins but who did not hold German citizenship". The term is the nominalised plural of volksdeutsch, with Volksdeutsche denoting a singular female, and Volksdeutscher, a singular male. The words Volk and völkisch conveyed the meanings of "folk".