You have already learned about other messaging solutions, which allow you to ease communication between your services, and all are characterized by different features. In Azure Event Hub, you were able to process thousands of messages per second, while with Azure Storage Queues you were given a reliable and durable solution, which you could use to work asynchronously on ingested data. In this chapter, we will discuss Azure Service Bus, a multitenant cloud messaging service that introduces advanced concepts like first-in,first-out(FIFO) messaging, dead lettering, or transactions. It is an enterprise-class cloud component able to integrate many different services and applications.