As described above, a domain name is the name that people type in their browsers to access your website.
A domain name is hierarchical and can consist of a number of parts called labels:
If you want to host more than one website under your subscription, you can register more domains and add them to your subscription. Registering new domains may be available to you in the Control Panel if your hosting provider allows this. For information on how to purchase and add domains in Plesk, refer to the section Adding Domains.
In fact, domain names exist only for convenience; the real communication between browser and web servers uses IP addresses - the numerical host identifiers. For example, the real address of www.example.com may be 192.0.2.12 (IPv4). To resolve domain names into IP addresses, web hosts use DNS technology. For more details about how DNS is implemented in Plesk, refer to the section (Advanced) Configuring DNS for a Domain.
DNS allows several domains to be resolved into one IP address. Such additional names are called domain aliases. This is convenient when you have purchased several domains that you want to point to the same website. For information on how to add aliases to existing domains, refer to the section Adding Domain Aliases.