Definition

Asynchronous microservices are different from synchronous microservices, which are covered in depth in Chapter 9.

A microservice is synchronous if it makes a request to other microservices while processing requests and waits for the result.

The logic to handle a request in the microservice might therefore not depend on the result of a request to a different microservice.

So, a definition of asynchronous microservices would be:

A microservice is asynchronous if:
(a) It does not make a request to other microservices while processing requests. OR
...