Domain names are words used to identify specific organizations or computers on the Internet. The domain name contains at least two words separated by a period. For example: Mosaic’s domain is Most domain names end with .com .net or .org. Letters, numbers and a hyphen are the only valid characters that can be used in a domain name. The number of characters you can use in your domain name is a total of 67, including the extension .COM, .NET, .ORG. “www.” and http://www. are not considered part of your domain. No two people or organizations can have the same domain name. To manage that, we have to purchase our domain names through a registrar.