French phrase
Quels ~ faut-il ?
Meaning
Which ___ are needed?
When to use it
Asks which items are required. Used for practical questions, with a neutral and fairly polite tone.
Example dialogue
Quels documents faut-il ?
Which documents are needed?
Il vous faut un passeport valide et, selon la destination, un visa et des justificatifs de réservation.
You need a valid passport and, depending on the destination, a visa and proof of reservation.