By creating an addon domain, you can control multiple domains from a single account. This allows you to host multiple websites without affecting the other domains in your account, as the addon domain has its own directory.
Each addon domain will appear in the file structure like a primary domain. All independent cPanel functionality, email accounts creation and management, QuickInstall installations, redirects, subdomains, etc., will be part of the addon domain.
To create an addon domain, you'll need to follow these instructions after accessing your cPanel account.
Head to Home > Domains > Addon Domains
Fill out the text box New Domain Name with the addon domains details
The cPanel application will automatically create the Subdomain and Document Root text boxes a. If you wish to adjust the subdomain, you can. This will allow you to create multiple addon domains with that username but different extensions. For example, .com and .net. Create that username in this text box b. If you wish to change the name of the Document Root folder, change the name with this text box
Check the box "Create an FTP account associated with this Addon Domain" if you want an FTP client attached.