What Is an Event in the Apache Kafka Ecosystem?

The concept of events has been explored in various contexts within the Apache Kafka ecosystem, including event-driven design, event sourcing, and stream processing. Events are representations of facts or things that happen, and their role can vary depending on the context. Designing events involves carefully choosing a conceptual model for event representation based on the role the event plays, while event streaming involves aggregating, filtering, and joining multiple streams in real-time. Event-driven design refers to building architecture that's aware of events using patterns such as event notification, event-carried state transfer, and command query responsibility segregation. These concepts are crucial for designing reactive data structures and building applications that can handle real-time data pipelines and applications. Understanding these ideas is essential for developers looking to build scalable and efficient systems.