Can one microservice use another microservice?

Can we call one microservice from another?

This is the second part of the Microservice Communication series. Let's see the sequence of how one microservice calls another microservice using Eureka server. Registering the Service: Each microservice should be registered into the service registry with a unique name {service-id}, so it can be identified.

Should a microservice call another microservice directly?

I would generally advise against having microservices do synchronous communication with each other, the big issue is coupling, it means the services are now coupled to each other, if one of them fails the second is now fully or partially disfunctional.

How does 2 microservices communicate with each other?

The two commonly used protocols are HTTP request/response with resource APIs (when querying most of all), and lightweight asynchronous messaging when communicating updates across multiple microservices.

Can a microservice have multiple services?

To answer your question, "can microservices contain multiple apps", I think it would be better to explain some concepts here. First, there really is no agreement on how "micro" a microservice is, or even on the best way to break down an app into separate domains that work well together.