The Publish/Subscribe (Pub/Sub) pattern is a widely-used software architecture paradigm, particularly relevant in the design of distributed, messaging-driven systems. The communication framework is decoupled, scalable, and dynamic, making it useful for addressing complex software requirements in modern application development.
At its core, the Pub/Sub pattern is about decoupling the message producer (publisher) from the message consumer (subscriber). In this framework, publishers broadcast messages without the knowledge of subscribers, and subscribers receive messages based on their interest without knowing about publishers. This decoupling is facilitated through a central component known as the message broker or event bus, which manages the delivery of messages.