Azure Service Bus provides cloud-enabled communication with enterprise messaging and relayed communication that helps you connect on-premises solutions with the cloud. See Azure Service Bus documentation for a comprehensive conceptual documentation for the service.
The REST APIs fall into the following categories:
Azure Resource Manager: APIs that perform Resource Manager operations, and have /providers/Microsoft.ServiceBus/ as part of the request URI.
Service Bus service: APIs that enable operations directly on the Service Bus service, and have the public cloud endpoint namespaceName.servicebus.windows.net in the request URI. Other possible domain names are as follows:
Discover how to write code in .NET applications using Azure Service Bus for communications that can handle high demand, low bandwidth, and hardware failures.