One server can supply all Internet services (such as mail or web) for several domain names. For example, the domain name www.example.com can resolve to the same IP address as www.server.org. This domain appears as multiple servers, but they’re all one server at one IP address.
Setting up DNS records for this service is easy: add a DNS zone and then add host names and server information to that zone.
Setting up DNS names for these services doesn’t enable or configure the service for the domain names. This configuration is used with virtual domain hosting in mail and web services.