If you want to point a domain address that you have to a different domain address or subdomain, the best way to do this would be to use a CNAME record. By setting up such a record, the domain name being forwarded loses all of its records (A, MX, and so on) and instead, it takes the A record of the domain it's directed to. By doing this, 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 Internet site which you have set up, but it will also be displayed in the web browser address bar at all times. Alternative possible uses of a CNAME record are to direct all the traffic from different subdomains to their main domain address, or to use the webmail service of your hosting company by using webmail.your-doman.com, for example. The latter will work only by creating a CNAME record for a subdomain simply because this kind of a record set up for the main domain address renders it impossible to use e-mail addresses.