What is a Domain Name?

Domain names are used to create more memorable names to use in place of numeric IP addresses. Domain name allow the use of unique alphanumerical addresses instead of numeric ones, Internet users more easily find and communicate with web sites and other server-based services by their Domain names.
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Domain names are restricted to the alphabetic letters “a” through “z” (case-insensitive), the digits “0″ through “9″, and the hyphen (-),  and domain name must start with a letter or a digit, and can not use hyphen in the beginning or end of a domain name.

Below are 3 examples illustrating the difference between a URL (Uniform Resource Locator) and a domain name:

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