juniorAzure Service Bus
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?