A subdomain is described as domain in the Domain Name System which is underneath another domain name in the hierarchy, for example:

• domainname:   altmint.com
• subdomain:       blog.altmint.com

How to create a Sub domain

A subdomain is a second website, with its own unique content, but there is no new domain name. Instead, you use an existing domain name and change the www to another name.

To create a subdomain:

1. Login to cPanel and click Subdomains.
2. In the drop-down, choose the domain.
3. In the box before the domain, type the subdomain name you want.
4. Click inside the “Document Root” box and it will auto-fill.
5. Hit the Create button.

Subdomains are Free!

Unlike domains, sub domains can be created “at will”. For any domain, you can create as many subdomains as you like; you do not have to go to a registrar and pay an annual fee for each of them.