A domain name is the address that people enter into their browsers to access your website.

A domain name is hierarchical and consists of several parts called labels:

- **Top-Level Domain (TLD):** The label furthest to the right, such as `.com` in `www.example.com`. There are a limited number of TLDs, each managed by separate international authorities.

- **Second-Level Domain (SLD):** The label that typically indicates the purpose of your website. For example, in `www.example.com`, `example` is the SLD. The combination of the SLD and TLD specifies the exact location of your website.

- **Subdomain:** Each label to the left of the SLD is a subdomain of the domain to its right. For instance, `www` is a subdomain of `example.com`. Subdomains can be used to organize content, such as creating `myblog.example.com` for a personal blog. For instructions on adding subdomains in Plesk, see the section on Adding Subdomains.

If you wish to host multiple websites under your subscription, you can register additional domains and add them to your subscription. This option may be available in the Customer Panel if supported by your hosting provider. For details on purchasing and adding domains in Plesk, refer to the section on Adding Domains.

Domain names are used for convenience; the actual communication between browsers and web servers relies on IP addresses, which are numerical host identifiers. For instance, `www.example.com` might correspond to the IP address `192.0.2.12` (IPv4). DNS technology is used to resolve domain names into IP addresses. For more information on DNS configuration in Plesk, see the section on Configuring DNS for a Domain.

DNS also supports resolving multiple domains to a single IP address using domain aliases. This feature is useful if you have several domains pointing to the same website. For instructions on adding domain aliases, refer to the section on Adding Domain Aliases.