A private zone contains information about how to map a domain name and its subdomains used within one or more VPCs to private IP addresses. With private domain names, your ECSs can communicate with each other within the VPCs without having to connect to the Internet.
You can create any domain names without registering them.
One private zone can be associated with multiple VPCs, and domain names are valid only in VPCs.
To use private domain names, you must first create a private zone and associate VPCs with it.
This chapter describes how to create and manage private zones.