A domain name is a unique name that can be entered into a browser to resolve the numeric address (called the IP address) of your web site or email server. A domain name tells people (and the computers they use) how to find your homepage on the Internet. Your hosting provider assigns each domain name to a numerical IP (Internet Protocol) address. It takes the form of a name of your choice coupled with an extension relating to the type of site. Current gTLD ("generic Top Level Domain) extensions are .com (meant for business sites), .org (meant for non-profit organizations), and .net (meant for internet service providers). People remember names better than numbers, but computers translate www.yourname.com into IP address numbers.  If you want to know information about domain name,please click http://www.eranet .com