Axon 4.0 was released on October 18, 2018 as the successor to Axon Framework 3.*. The name change from "Axon Framework" to "Axon" is intentional: starting from 4.0, Axon is not just a framework, but a complete platform consisting of both Axon Framework and Axon Server.
While many types of applications can be built using Axon, it has proven to be very popular for microservices architectures. Many of the recent changes to Axon have been made with this use case in mind.
Please visit the AxonIQ website to learn more about AxonIQ and the Axon community. There, you will find information about Axon training, support options, upcoming and past events.
In the subsequent pages, you'll find an architecture overview of the Axon platform and details about the licensing. After that, the two main components, Axon Framework and Axon Server, will be described in depth. Finally, the guide covers migration from prior Axon Framework versions.