French · Question Words
why
Used to ask for a reason or explanation.
Pourquoi es-tu triste?
Why are you sad?
'Pourquoi' comes from the combination of 'pour' (for) and 'quoi' (what), literally translating to 'for what', evolving into its current form used to ask reasons.
'Pourquoi' is commonly used in both spoken and written French, largely in informal contexts, though it can appear in more formal situations as well.