Subdomains
Subdomains (also called "third-level" domains) allows you to create one or more prefixes for your domain name which are treated as a separate area of your website. For instance, let's say your domain name is example.com. You can create a subdomain called store.example.com in which you can put your product catalog or shopping cart software. If your website has a help section, you might want to put that in help.example.com.

A subdomain can have its own FTP area separate from your main website space (complete with its own password), or you can integrate your subdomains with your main site. You can add or delete subdomains anytime you wish via our online control panel. Most websites don't use subdomains, but for those that need them subdomains are a great way to separate and identify various sections of your website.

Here's another example of a subdomain: At Intelligent Hosting we use a subdomain for our support area, http://support.intelligenthosting.com.