Introduction to Message Queues

Welcome! In modern applications, services often need to talk to each other. But what if one service is busy or down?

Message queues provide a reliable way for different parts of an application, or even different applications, to communicate asynchronously.

One of the biggest advantages of message queues is decoupling. Imagine two services: Service A needs to tell Service B to do something.

• Without a queue, Service A calls Service B directly. If B is offline, A fails.
• With a queue, A sends a message to the queue. A doesn't care if B is ready; the queue holds the message.

This makes services independent and more resilient.