Grokking Microservices for System Design Interviews
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Message Brokers: Why They Exist

1. The Definition

A message broker is a service that sits between producers and consumers of messages. Kafka, RabbitMQ, and Amazon SQS are the three names you will meet most often.

A producer is any service that sends a message. A consumer is any service that reads one. Producers hand messages to the broker, the broker stores them durably (written to disk so a restart does not lose them), and consumers take them at their own pace.

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