Event Streaming refers to the real-time processing of events as they are produced and consumed. This allows microservices to react to changes in the system in real-time and make decisions based on the most up-to-date information. 

https://pandio.com/what-is-event-streaming-why-is-it-growing-in-popularity/#:~:text=Event%20streaming%20includes%20lightweight%20protocols,changes%20to%20the%20original%20workflow.