Subdomains - Make organising your site easier | Web Hosting
Simplify your web addresses by creating sub-domains.
Once you have created your website, you may want to use sub-domains to create different web addresses for unique content areas on your website. For example, you could create a sub-domain for www.forum.yourwebsite.com.
Make organising your site easier
Each sub-domain is associated with a folder that contains the part of the website concerned.