The term domain name has multiple related meanings:

• A name that identifies a computer or computers on the internet. These names appear as a component of a Web site's URL, e.g. www.total1.net. This type of domain name is also called a hostname.
• The product that Domain name registrars provide to their customers. These names are often called registered domain names.
• Names used for other purposes in the Domain Name System (DNS), for example the special name which follows the @ sign in an email address, or the Top-level domains like .com, or the names used by the Session Initiation Protocol (VoIP), or DomainKeys.

They are sometimes colloquially (and incorrectly) referred to by marketers as "web addresses".