Explain the concept of an information broker and its role in system architecture.

An information broker is a component or service that acts as an intermediary for message exchange between different parts of a system or between different systems.

The role of the broker is to receive messages from senders and deliver them to recipients, ensuring asynchronous, reliable, and scalable interaction. This allows components not to depend directly on each other, simplifying architecture and increasing flexibility.

For example, in a microservices system, a message broker (like RabbitMQ or Kafka) receives events from one service and forwards them to others that are subscribed to these events.