Alias domains are additional domains hosted on your account which display the same website as your primary domain.
For example, if you own mystore.com and it is the primary domain of your cPanel account, you can set up mystore.net as an alias domain and it will load the content of mystore.com. When you visit mystore.net, you will notice that although the content of mystore.com is loading in the browser, the address bar will display mystore.net.
Alias domains are useful for instances where you own multiple extension of the same domain name and you want them to all load the same content. If you own the .com version of your domain but also own the .net and .org versions of the same domain you can set them up as Aliases in cPanel so they point to the .com.
How to Add An Alias Domain in cPanel
Login to your cPanel and click the Aliases icon. in the Domain field you would type in the domain name you wish to add as an alias and then click the Add Domain button.
That’s it! You can now type in your newly added alias domain in your browsers address bar and it should load the content of your primary domains website.