# Inter-Service Communication

As described in \[What are projects and services?], if you want to compose one product with multiple services, you need communication between each service within AppPaaS. 

To support this internal communication, AppPaaS provides internal DNS information. You can see the internal domain information on the service details page. 

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You can use internal domains to separate services that you want to make public from services that you want to manage privately internally.&#x20;

**Service Visibility**&#x20;

As described above, communication between internal services is possible through internal DNS. However, this visibility is only allowed between services created within the same account. If you try to connect to the internal domain of a service created from another account, the connection will be denied.


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