Site Aliases
In DNN, it's possible for you to specify more than one domain name for your website to respond to. For example, domain1.com and domain2.com could potentially be the same website. The site alias feature allows you to easily do this by simply adding the new/alternate domain name or URL. These additional domain names might function in a redirect or canonical fashion. It's up to you.
There are many other ways to leverage the site alias feature such as migrating websites during rebranding, development, staging, and testing. For instance, you may have a production website at example.com. Using this feature you could restore the production website in a staging environment and change the primary site alias to be dev.example.com.
Note
This feature is sometimes referred to as portal alias or HTTP alias as well.
Learn more about how to use and interact with this feature: