If you wish to direct a domain that you have to a different domain or subdomain, the best way to do this would be to use a CNAME record. By creating such a record, the domain name being redirected loses all its records (A, MX, and so forth) and instead, it takes the A record of the Internet domain it's forwarded to. That way, if you use a web design service by some provider that gives you a subdomain, you can use an actual domain and not only will it be pointed to the website that you have set up, but it will also be displayed in the Internet browser address bar at all times. Other possible uses of a CNAME record are to point all of the traffic from different subdomains to their main domain address, 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 set up for the main domain renders it impossible to use e-mail addresses.
