What is a domain name?
A domain name is a name that identifies a computer or computers on the internet. These names appear as a component of a Web site's URL, e.g. 
http://www.pbconsulting.com or http://www.sustainabilityforum.com
Why is a domain name valuable?
On a basic level, domain names are important because the Internet's addressing scheme is not very effective without them.
Each computer on the Internet has an Internet protocol (IP) address: a unique string of four numbers separated by periods, such as 165.166.0.2. Since remembering the IP addresses of all of your favorite Web sites would be nearly impossible, a group of computer scientists created the domain name system to assign a unique name to each numeric IP address.
But domain names are much more than just a technical shortcut. A short, memorable domain name can make the difference between creating a successful Web presence and getting lost in cyberspace.
If you want your website to be found on a certain topic or keyword, having this exact domain name is the best starting point for a successful internet presence. Domain names also have an inherent value as each domain name is unique.
