What is to what do i owe the pleasure?

To what do I owe the pleasure is a polite and formal expression used when someone unexpected or important has come to visit or meet you. It is often used in business or formal situations to express gratitude or respect towards the guest. It can also be used as a way to inquire about the reason for the visit or meeting. The phrase is considered a way of acknowledging the significance of the occasion and showing good manners.