The default email address will catch any email that is sent to the mail email address for your domain.
Examples could be
These would all be deliver to your mail email address such as
In order to create catch-all email address in cPanel, follow the steps below
Log in your cPanel account
Navigate to Email section > Click on the Default Address icon:
On the new page choose domain name from drop-down menu, check option Forward to email address and enter email address to which emails will be forwarded
Click on Change to save settings