In cPanel Addon Domain is a feature which provides you to add extra domain name to your hosting account and each domain has its own separate website. (for example: yourdomain1.com & yourdomain2.com, etc) as your visitors can access each addon domain separately and each addon domain will appear as a completely different website.
To add an Addon Domain follow these steps:-
1) First log-in to your cPanel.
2)Click on Addon Domains icon and enter the following info:
New Domain Name: the addon domain which you like to add to your account (example: bodhost.com)
Username/directory/subdomain Name: the name of the subfolder of your account to upload the files of that addon domain (example: bodhost)
Password: any password (NOT your main account password), this password will be used to access the special FTP account of that addon domain
Note:Once the domain is added, you should be able to see a folder with the name of your domain (e.g. if your domain is bodhost.com your folder name is going to be bodhost – unless you change your folder name).