A subdomain is part of a web address which is under the main domain name, such as name.example.com. From a technical perspective, even in www.example.com the "www" element is a subdomain given that the fully qualified domain name is just "example.com". Each subdomain can have its own web site and records and can also be hosted using a different provider if you need to use a certain feature which isn't provided by your current provider. A good example for using a subdomain is if you have a business site as well as an online store under a subdomain where customers can purchase your products. You can even have a forum in which they can discuss the products and by using subdomains as opposed to subfolders you'll avoid any risk of all sites going down if you perform maintenance, or update one of the site scripts. Keeping the sites separated is also more secure in the event of a script security breach.
Subdomains in Semi-dedicated Hosting
You will be able to create as many subdomains as you wish with any of our Linux semi-dedicated packages as we haven't set a maximum limit for this feature. The Hepsia hosting CP will allow you to add a new subdomain with a few mouse clicks and you are going to be able to access a variety of advanced features during the process - change the default access folder, select the IP address the subdomain will use from the shared and dedicated ones that are available in your account, activate FrontPage Extensions, add an SSL certificate, plus much more. Even if you create a great number of subdomains, you'll be able to keep track of all of them with ease as they are going to be listed in alphabetical order below their main domain. For any of them, you are able to access the site files or view logs and usage stats using instant access buttons.