Spanish phrase
¿A qué se debe?
Meaning
What is the reason?
When to use it
Asks for the reason behind something. Polite, slightly formal way to inquire why someone did or changed something, used in everyday conversation.
Example dialogue
¿A qué se debe tu retraso?
What is the reason for your delay?
Perdón, hubo tráfico y un accidente en la carretera.
Sorry, there was traffic and an accident on the highway.