It's important to note that the word "you" in German depends on the context and formality:
* "Du" is the informal "you" used for friends, family, and people you know well.
* "Sie" is the formal "you" used for strangers, authority figures, and in professional settings.
So, depending on the context, the full phrase could be:
* "Was bist du?" (Informal)
* "Was sind Sie?" (Formal)
It's also possible that you're asking "What are you?" in the sense of "What is your occupation/profession?". In that case, the translation would be:
* "Was sind Sie von Beruf?" (Formal)
* "Was bist du von Beruf?" (Informal)