Pub/Sub (Publish-Subscribe) is a messaging pattern in which producers publish messages to a named channel (topic) without knowing who consumes them, and consumers subscribe to topics they care about without knowing who produced the messages. The pattern decouples producers from consumers, enabling fan-out, replay, and asynchronous processing.
How it differs from queues
Event-Driven Architecture (EDA) is a style in which services communicate by publishing and subscribing to events on a message bus, rather than calling each other synchronously. Producers emit events when something happens; consumers react to those events independently. The pattern reduces coupling and enables fan-out, replay, and asynchronous processing.
How it works
A producer publishes an…