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Domain Name System > URL Illustration

 
http: protocol and www subdomain
The domain name system allows names to be assigned to Internet resources and users independent of the physical location of the resource or user.  This is beneficial because domain names are easier to remember than IP addresses, which are series of numbers.  Even naive computer users can easily remember a URL, without having to understand how a computer locates it.
Link to this illustration page:
<a href="http://www.domain-name-system.us/domain-name-url.htm">Domain Name URL Prefix</a>
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Universal Resource Locator Protocol and Subdomain