If you wish to point a domain name that you have to some other domain address or subdomain, one of the ways to do that would be to use a CNAME record. By setting up such a record, the domain being forwarded loses all of its records (A, MX, etc) and instead, it takes the A record of the Internet 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 redirected to the site that you've set up, but it'll also appear in the browser address bar at all times. Other possible uses of a CNAME record are to redirect all the visitors from different subdomains to their main domain name, 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 simply because this kind of a record created for the main domain renders it impossible to use e-mail addresses.