What is the sub-domain/domain name used to locate Web sites?

Concurrent Versions System

Universal Modeling Language

Input Processing Output

Uniform Resource Locator

The [sub]domain name is part of the Uniform Resource Locator (URL). URLs also have the protocol path, optionally a port number, filename and arguments too.

More info than you want:

Syntax of a URL:

protocol://machineName. domain. name:port/path/to/fileName? arg1=something&arg2=somethingElse