Message queues (MQ) are an indispensable part of distributed systems. For many developers, MQ was initially perceived as a simple 'messaging tool'. However, as they gained experience with it, they came to realize its extraordinary potential. MQ is not just a matter of sending and receiving messages; it's a 'lubricant' that enables system operations such as decoupling, load smoothing, and asynchronous task processing.

In this article, we will delve into 10 classic use cases of MQ, starting from simple to complex, to help you understand its practical applications. Whether you're a seasoned developer or a newcomer to the world of distributed systems and message queues, you'll find valuable insights in this article.