If you want to direct a domain address that you have to another domain name or subdomain, the best way to do this would be to use a CNAME record. By creating such a record, the domain being redirected loses all its records (A, MX, and so forth) and instead, it takes the A record of the Internet domain it's redirected to. This way, if you are using a web design service by some provider that gives you a subdomain, you can use an actual domain and not only will it be forwarded to the site you have created, but it will also appear in the Internet browser address bar at all times. Alternative possible uses of a CNAME record are to redirect 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 simply because this kind of a record set up for the main domain address makes it impossible to use e-mail addresses.