If you want to forward a domain address that you have to another domain address or subdomain, the best way to do that would be to use a CNAME record. By creating such a record, the domain address being pointed loses all of its records (A, MX, and so forth) and instead, it takes the A record of the domain name it's redirected to. This way, if you are using 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 site you have created, but it'll also appear in the web browser address bar at all times. Other possible uses of a CNAME record are to direct all the visitors from different subdomains to their main domain, or to use the webmail service of your hosting company by using webmail.your-doman.com, for instance. The latter will work only by creating a CNAME record for a subdomain since this kind of a record created for the main domain makes it impossible to use e-mail addresses.