Not wait response and have blocked a thread
AMQP
One to One (queeu)
one to many
Publish/subs
Event Driven
Use Saga , Use CQRS
In One-to-one asynchronous communication, the sender microservice requests specific information or data from the recipient microservice, and the recipient microservice processes the message and sends a response back.
https://medium.com/@aamermail/asynchronous-communication-in-microservices-14d301b9016