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Do microservices communicate using Rest-clients or Message-Queue?

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Hi experts,
May i know how do the microservices of an application communicate with each other? I saw some examples on internet, it uses some rest clients like RestTemplate/WebCLient/Feign.
It seems these rest-clients are just for practice purpose while real microservices based applications use something else like RabbitMQ etc. May I know your opinion on this?

I would also like to know:
When every microservice has its separate db then how does the linking between the tables of separate DBs like one-to-many, many-to-many work?

Thanks in advance.
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Every microservice owns its data and its domain logic. If you are using a synchronous request->response comunication, HTTP or ReST are the most common protocols, if you are communicating within your microservices cluster, other formats might be more useful. If you have a @OneToMany relationship between microservices, your layout probably has room for improvement. Try to avoid "distributed monoliths".
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