What are message brokers used for?

Message brokers are needed to organize data exchange between different components or services in distributed systems. They provide asynchronous communication, allowing the sender and receiver to operate independently in time.

Main tasks of message brokers:

• Message buffering: temporarily storing messages if the receiver is not ready to process them.
• Decoupling components: the sender does not know or depend on the receiver, which increases flexibility and scalability.
• Ensuring reliability: guarantee message delivery, support retransmission in case of failures.
• Load distribution: enable balancing message processing among multiple consumers.

Example of use: in microservice architecture, services exchange events through a broker (e.g., RabbitMQ, Kafka), which allows them to operate independently and scale.

Thus, message brokers simplify the construction of resilient, scalable, and flexible systems.