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. The subdomain name looks like sub.domain.com, help.domain.com, secure.domain.com (assuming you already host: domain.com).
Managing Subdomains in cPanel
An addon domain is a second domain with which you are going to host additional website, with its own unique content located within your single cPanel account.
Managing Addon Domains in cPanel
Parked Domain (also called Aliases)
A Parked/Alias domain is NOT a unique website. Instead, it is a masked forward to the primary domain name of your cPanel account, much like a website alias. Parked domains are commonly used when:
- You have a .COM and .COM.AU domain name going to the same site
- You need a place to park a domain for which you do not have a website
- You have more than one domain that should lead to your primary domain
- You have common misspellings of your domain name that you have registered