If you would like to point a domain address that you have to another domain name or subdomain, one way to do that would be to use a CNAME record. By setting up such a record, the domain address being redirected loses all its records (A, MX, and so on) and instead, it takes the A record of the Internet domain it's pointed to. That way, if you use a web design service by some provider that gives you a subdomain, you can use an actual domain name and not only will it be pointed to the website you have set up, but it will also appear in the browser address bar at all times. Other possible uses of a CNAME record are to forward all of the traffic from different subdomains to their main Internet domain, or to use the webmail service of your hosting provider by using webmail.your-doman.com, for instance. The latter will work only by setting up a CNAME record for a subdomain since such a record set up for the main domain makes it impossible to use email addresses.