German diaspora (German: Deutschstämmige, historically/national social terminology also Volksdeutsche) are ethnic Germans and their descendants living outside of Germany.
Outside Europe, descendants of Germans have largely assimilated into their host societies, including adopting the local language and adapting their German family names, e.g., through Anglicisation.
Volksdeutsche ("ethnic Germans") is a historical term which arose in the early 20th century and was used by the Nazis to describe ethnic Germans living outside of the Third Reich, although many had been in other areas for centuries. During World War II, Hitler forbade the use of the term because it was being used in a derogatory way against the many ethnic Germans in the SS. It is used by many historians who either deliberately or innocently are unaware of its Nazi history.
Auslandsdeutsche (adj. auslandsdeutsch) is a concept that connotes German citizens living abroad, or alternatively ethnic Germans entering Germany from abroad. Today, this means a citizen of Germany living more or less permanently in another country (including long-term academic exchange lecturers and the like), who are allowed to vote in the Republic's elections, but who usually do not pay taxes to Germany. In a looser but still valid sense, and in general discourse, the word is frequently used in lieu of the ideologically tainted term Volksdeutsche, denoting persons living abroad without German citizenship but defining themselves as Germans (culturally or ethnically speaking).