If you want to point a domain address that you have to another domain name or subdomain, a good way to do that would be to use a CNAME record. By creating such a record, the domain address being redirected loses all its records (A, MX, etc) and instead, it takes the A record of the Internet domain it's directed to. In this 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 forwarded to the Internet site you have set up, but it'll also appear in the Internet browser address bar at all times. Other possible uses of a CNAME record are to direct all of the targeted traffic 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 setting up a CNAME record for a subdomain because such a record created for the main domain makes it impossible to use email addresses.
