An addon domain is an additional domain that is stored as a subdomain of your main site. Usually, you use addon domains to host additional domains on your hosting account. Read more on how to create and delete addo..
Login to your cPanel. Under Domains section, click on Addon Domains. From the Addon Doamins form, specify the domain details as shown in the image bellow. This includes the addon domain name, subdomain, domain root, and an option to create FTP accounts for the domain. Once specified all details as required, click on Add Domain ..