Message Broker
A message broker is an intermediary software component that facilitates communication between distributed systems by receiving, routing, and delivering messages between applications. It decouples message producers from consumers, enabling asynchronous communication and improving system reliability and scalability. Common implementations include RabbitMQ, Apache Kafka, and ActiveMQ.
Developers should use message brokers when building distributed systems that require reliable, asynchronous communication, such as microservices architectures, event-driven applications, or data streaming pipelines. They are essential for handling high-volume data flows, ensuring message delivery guarantees, and enabling systems to scale independently without tight coupling.