An Introduction to Domain Names :

Simply put, a domain name is a "front" - they are word sequences users enter in their browser’s location bar to visit your site, but are not a Web site's true address. Domain names are attached to DNS (Domain Naming System) servers, which are used to translate numeric addresses (known as IP,or Internet Protocol, addresses) into words. Each site you visit on the net has a numeric IP address behind its name, which represents the site's true address on the Internet.

Domain names are typically categorized by their extension, which is their identifying code. The three most popular types of Top Level Domains (TLDs), which are domains that are not associated with a country, are:

.COM: Short for .commercial. Domain names with the .com extension are by far the most popular, and can be purchased by any individual or business. .

.NET: Short for .network, this domain extension was originally designed to be used by technical Web sites. However, domains using this extension can be registered by anyone.

.ORG: Short for .organization. Originally designated for non-profit firms and any other organizations that did not fit under the .com or .net extension, any individual or business may now register a .org domain name.

Source: dnessentials.com

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