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Why is subdomain created after I add an add-on domain?

Creating an addon domain in the cPanel interface automatically creates a subdomain.

Altering or deleting the subdomain after it has been created may affect or delete the information displayed in the addon domain's website.

Add-on domain is a special type of subdomain. An add-on domain is a subdomain that also has its own VirtualHost container, separate from the main domain, with its own document root defined.

There is no way to add an addon domain without a corresponding subdomain because this is fundamental to the design of addon domains on cPanel.