DDS3, or Data Distribution Service version 3, is a middleware standard for real-time data communication. It facilitates scalable and reliable data exchange among distributed applications, enabling the development of systems that require high performance and low latency, such as in autonomous vehicles or IoT devices. DDS3 defines a publish-subscribe communication model, allowing applications to publish data and subscribe to updates seamlessly. It is designed to support complex data types and dynamic discovery of data producers and consumers in a distributed environment.