If you'd like to point a domain address that you have to another 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 being pointed loses all of its records (A, MX, etc) and instead, it takes the A record of the Internet domain it's redirected to. By doing this, 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 redirected to the site that you have created, but it will also appear in the Internet browser address bar at all times. Other possible uses of a CNAME record are to point 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 instance. The latter will work only by creating a CNAME record for a subdomain because such a record created for the main domain renders it impossible to use email addresses.
