French Phrase
Un DAE, ça sert à quoi ?
Meaning
The speaker is asking what the purpose of a DAE (automated external defibrillator) is. It’s a casual way to request a brief explanation of the device’s function.
When to use
Use this sentence when you see a DAE in a public place (gym, airport, school) and want to know what it does, especially in informal conversation with friends or colleagues.
✦Grammar Breakdown
UnDAE,çasertàquoi?
Un (indefinite article)
Used before a masculine singular noun to mean 'a' or 'one'.
DAE (abbreviation)
Stands for 'Défibrillateur Automatisé Externe', a medical device.
ça (demonstrative pronoun)
Informal way to say 'it' or 'that' in spoken French.
sert (verb servir)
Third‑person singular present of 'servir' meaning 'to be useful for'.
à quoi (interrogative)
Literally 'to what', used to ask the purpose of something.
🗨In Conversation
Un DAE, ça sert à quoi ?
What’s a DAE for?
C’est un appareil qui délivre un choc électrique pour rétablir le rythme cardiaque en cas d’arrêt cardiaque.
It’s a device that delivers an electric shock to restore a normal heartbeat during cardiac arrest.
✕Common Mistakes
Un DAE, c’est sert à quoi ?
Using "c’est" changes the meaning to "What is a DAE?" rather than asking its purpose.
Un DAE, ça sert pour quoi ?
"pour quoi" is not idiomatic; use "à quoi" for purpose.
Un DAE ça sert à quoi ?
Missing the comma makes the sentence sound rushed; the pause after the abbreviation helps listeners process the abbreviation.
↔Alternatives
À quoi sert un DAE ?
What is a DAE used for?
Quel est l’usage d’un DAE ?
What is the use of a DAE?
Ce DAE, à quoi il sert ?
What does this DAE do?
Cultural Tip
In everyday French, "ça" is perfectly natural, but in a formal presentation you’d replace it with "il" or "le": "À quoi sert le DAE ?" Also, French public spaces are increasingly required to have a DAE, so you’ll often see the device in gyms, schools, and airports across France and French‑speaking Canada.