What is the difference between Queue and Topic in Azure Service Bus?

Updated Apr 23, 2026

Short answer

Queue is point-to-point messaging, Topic supports publish-subscribe with multiple subscribers.

Deep explanation

Queues deliver messages to a single consumer, ensuring one-to-one communication. Topics allow multiple subscriptions, enabling fan-out messaging where multiple consumers receive copies of the same message.

Real-world example

Order event sent to topic → inventory, billing, and notification services consume it.

Common mistakes

  • Using queue when multiple consumers are required.

Follow-up questions

  • What is subscription in topic?

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