An alias domain (also called a domain alias or parked domain) is a secondary domain name that points to your primary domain. When visitors access the alias domain, they'll see the content from your primary domain, but the alias domain will remain in the browser's address bar.
Syntax
alias <Alias Domain> <Main Domain>
Examples
$ /go/alias alias.com main.com
Replace alias.com → The domain to alias.
Replace main.com → The primary domain.