Microservices don’t call each other, instead, they created

events and consume events from message broker systems

in an async way.

▪ AMQP (Advanced Message Queuing Protocol)

▪ Publish/Subscribe pattern with events

▪ Using AMQP protocols, the client sends the message with

using message broker systems like Kafka and RabbitMQ

queue.

▪ The producer service of the events doesn't know about its

consumer services. the consumers also don’t necessarily

know about the producer.

▪ Decouple services and build loosely coupled microservices.

▪ No clear central place or orchestrator, This increase

complexity of architecture.

https://www.altexsoft.com/blog/event-driven-architecture-pub-sub/