Meanings
where from, whence
Woher kommt ihr? (informal, plural)Where do you come from?
how (not the general meaning of "in which way", but meaning "from which source" or "from where" exactly)
Woher soll ich das wissen?How should I know?
interrogativfrom where
Woher kommst du?
Examples
GermanEnglish
Woher hat Tom denn so viel Geld?Where did Tom get that much money?
Woher weißt du, dass er das braucht?How do you know he needs it?