"domain name" is the registered "www"
name or "web address" of a web site.
Specifically, Webster's Dictionary of Computer
Terms has these definitions:
A "domain name system" is defined as:
In the Internet, the conceptual system,
standards, and names that make up the hierarchical organization of the
Internet into named domains.
and a "domain name":
In the system of domain names [a domain
name is] used to identify individual Internet computers, a single word
or abbreviation that makes up part of a computer's unique name [such as
blackwellwebdesign.com]. ... At the end of the series of
domain names is the top level domain (here, "com") ....
Both definitions are from Webster's New World Dictionary of Computer Terms,
We have found that "domain name," "URL," and
"web address" are usually used by the general public interchangeably.
Do you need a domain name?
The Website 101 pages are basic informational pages to provide an overview
of some of the more standardized functions of most web sites.
to WebSites 101 Main Page