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Address of a computer, organization, or other entity on a TCP/IP network such as the Internet. Domain names are typically in a three-level server.organization.type format. The top level denotes the type of organization, such as com (for commercial sites) or edu (for educational sites); the second level is the top level plus the name of the organization (e.g., britannica.com for Encyclopædia Britannica); and the third level identifies a specific host server at the address, such as the www (World Wide Web) host server for www.britannica.com. A domain name is ultimately mapped to an IP address, but two or more domain names can be mapped to the same IP address. A domain name must be unique on the Internet, and must be assigned by a registrar accredited by the Internet Corporation for Assigned Names and Numbers (ICANN). See alsoURL.
This entry comes from Encyclopædia Britannica Concise. For the full entry on domain name, visit Britannica.com.