A domain name is a unique name that provides the identity for an Internet site. It always has two parts, separated by a dot. The part before the dot is specific to your company, product or service, while the part on the right of the dot roughly identifies which sector or even which industry the company, product or service is in. It is possible for a domain name to exist solely for the purpose of a group or business e-mail address without establishing an Internet site.

Domain names follow a hierarchy. A top-level domain describes the your type of organization. An example is .com, which is the usual top-level domain of a commercial entity.
U.S. top-level domains include:

Once you have determined what category of organization you fall under, you can apply for a second-level domain, such as www.yourcompanyname(.com).