If you wish to forward a domain address that you have to a different domain address or subdomain, a good 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 domain it is redirected to. That way, if you use a web design service by some company that gives you a subdomain, you can use an actual domain name and not only will it be pointed to the website which you have set up, but it will also be displayed in the browser address bar at all times. Alternative possible uses of a CNAME record are to redirect all the traffic from various subdomains to their main domain, or to use the webmail service of your hosting provider by using webmail.your-doman.com, for example. The latter will work only by creating a CNAME record for a subdomain since this kind of a record created for the main domain address makes it impossible to use email addresses.