If you want to point a domain address that you have to another domain name or subdomain, the best way to do that would be to use a CNAME record. By setting up such a record, the domain name being redirected loses all of its records (A, MX, and so forth) and instead, it takes the A record of the Internet domain it is forwarded to. That way, if you are using a web design service by some company that gives you a subdomain, you can use an actual domain and not only will it be directed to the site that you have set up, but it will also be displayed in the web browser address bar at all times. Some other possible uses of a CNAME record are to forward all the targeted 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 because this kind of a record created for the main domain name makes it impossible to use email addresses.