What is Sub-domain?
A subdomain is a subsection of your website that sometimes exists as a subdirectory of your public_html (document root) directory
or your account’s home directory. Subdomains use a prefix in conjunction with the domain name.
In simple words, A subdomain is a subsection of your website that can exist as a new website without a new domain name.
Use subdomains to create memorable URLs for different content areas of your site.
For example, you can create a subdomain for your blog that is accessible through blog.example.com and www.example.com/blog
You can use subdomains to create unique user accounts for vanity domains.
How to add Subdomains?
To create a subdomain, perform the following steps:
1. Enter the desired prefix (Subdomain) in the Subdomain text box.
2. Select the desired main domain from the menu.
3. Document root is taken automatically but if you want other path the enter the home directory for the subdomain in the Document Root text box manually.