The Publish/Subscribe Pattern is a messaging pattern where a single microservice, known as the publisher, sends messages to a message broker or messaging queue, which then distributes the message to multiple other microservices, known as subscribers. Each subscriber receives the message and processes it independently, without the need for real-time interaction with the publisher. 

https://aws.amazon.com/pub-sub-messaging/#:~:text=Publish%2Fsubscribe%20messaging%2C%20or%20pub,the%20subscribers%20to%20the%20topic.

The Publish/Subscribe pattern, also known as pub/sub, is an architectural design pattern that provides a framework for exchanging messages between publishers and subscribers.

 This pattern involves the publisher and the subscriber relying on a message broker that relays messages from the publisher to the subscribers.

https://riptutorial.com/design-patterns/example/6498/publish-subscribe-in-java