from cPanel said:Subdomains are URLs for different sections of your website. They use your main domain name and a prefix. For example, if your domain is me.pcriot.com a sub-domain of your domain might be support.me.pcriot.com .
If you have domain names, you can add the domains to your account to host multiple sites.
If you don't have TLD, consider getting a .co.cc domain. Its Free, i think.