An addon domain is a fully functional additional domain that can be created from within your control panel & stored as a subdomain of your main site. It is just like that you are using one cpanel for multiple domains. All the resources provided under single cpanel is shared among the main domain and addon domains. You can have emails, forwarders, etc. just like main domain. The only difference is that they all are in same cpanel.
Create an addon domain
To create an addon domain, perform the following steps: