Pronouns
das Interrogativpronomen / das Fragewort
In English: question word
A word that opens an information question: wer, was, wo, wohin, woher, wann, wie, warum, welcher. The verb comes right after it. Wer changes with the case: wer, wen, wem, wessen.
Example: Wen besuchst du am Wochenende? Wem gehört die Jacke?