Why use a private hosted zone for Amazon VPC (Virtual Private Cloud), in contrast to a public hosted zone.

Private hosted zones are a great way to avoid hard coding IP addresses in applications without having to create publically available domain names. Private hosted zones are resolvable only by resources within the VPCs that are associated with the zone. This means any domain name can be created, even if it's already a domain name that's in use on the public internet. This is useful if the requirement of instances to resolve a certain domain name to one IP address while having users on the internet resolve the same domain name to a different IP address. This is often called split-brain DNS.