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Posted in Languages

Most natural way of saying “What is this for?” ?

The first expression that comes to me is:

À quoi ça sert ?
Ça sert à quoi ?

You could also say:

À quoi cela sert-il ?

Quel est l’utilité/l’usage de cet objet ?

EDIT

What is this used for?

may, among other ways, be translated by

À quoi est-ce que ça sert ?

Strangely linguee.fr does not have any relevant example.