Azure Service Bus is an Azure-specific message broker service. It allows applications to exchange messages via queues and topics. Here is the difference between the two:

  • Queue: Each message is present only once and it’s instantly removed from the queue by a subscriber. So if many subscribers are connected to the queue, there is no way of configuring which subscriber receives which message.

  • Topic: It is similar to a queue, but each subscriber receives its own copy of the message. Therefore, if a specific subscriber has read the message, it will disappear from the topic only for that subscriber. All other subscribers will still be able to read it if they haven’t already.

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