When we talk about an "alias" of one domain name to another in the context of DNS (Domain Name System), we're referring to the CNAME (Canonical Name) record.
A CNAME record is used to create an alias or nickname for one domain name to another. Essentially, it allows you to map one domain name to another domain name. This is commonly used when you want multiple domain names to point to the same website or web server.
For example, let's say you have a website hosted at example.com, and you also own the domain example.net. Instead of setting up a separate website for example.net, you can create a CNAME record that points example.net to example.com. This means that when someone enters example.net into their browser, they will be directed to the same website as example.com.
In summary, a CNAME record allows you to create an alias for one domain name to another, simplifying management and ensuring consistency when directing traffic to a specific destination.