A subdomain is a part of a web address that is under the main domain name, for example name.example.com. Technically, even in www.example.com the "www" part is a subdomain because the fully qualified domain name is just "example.com". Every single subdomain could have its own web site and records and can also be hosted using a different provider if you need to use a specific feature that is not offered by your current service provider. A good example for using a subdomain is if you have a business site along with an online store under a subdomain where clients can acquire your products. Additionally, you can have a forum in which they can comment on the products and by employing subdomains instead of subfolders you'll avoid any chance of all websites going down if you perform maintenance, or update one of the site scripts. Keeping your sites separated is less risky in the case of a script security breach.
Subdomains in Semi-dedicated Hosting
Using our semi-dedicated server plans, you'll be able to create an unrestricted number of subdomains for any of the domains you add as hosted in the account. It will take a few mouse clicks to create a new subdomain and throughout the process you're going to be able to to add custom error pages for it, pick if it will use a shared or a dedicated IP address, change the default folder that it will access or activate FrontPage Extensions. All subdomains that you have within the account are going to be grouped under their root domain from a to z and you are going to be able to see and handle all of them with ease. Via fast access buttons and right-click menus you'll be able to jump to the website files inside the File Manager area or see logs, visitor statistics and other info about any of your subdomains.