collection from:
http://www.webopedia.com/TERM/D/domain_name.html=============================
A name that identifies one or more IP addresses. For example, the domain name microsoft.com represents about a dozen IP addresses. Domain names are used in URLs to identify particular Web pages. For example, in the URL
http://www.pcwebopedia.com/index.html, the domain name is pcwebopedia.com.
Every domain name has a suffix that indicates which top level domain (TLD) it belongs to. There are only a limited number of such domains. For example:
# gov - Government agencies
# edu - Educational institutions
# org - Organizations (nonprofit)
# mil - Military
# com - commercial business
# net - Network organizations
# ca - Canada
# th - Thailand
Because the Internet is based on IP addresses, not domain names, every Web server requires a Domain Name System (DNS) server to translate domain names into IP addresses.
See our list of Domain Extensions and the countries they coincide with in the Quick Reference section of Webopedia.
Also see Registering a Domain Name in the Did You Know section of Webopedia.