If you'd like to point 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 on) and instead, it takes the A record of the domain it's pointed to. That way, if you use a web design service by some provider that gives you a subdomain, you can use an actual domain and not only will it be pointed to the Internet site which you have set up, but it will also be displayed in the web browser address bar at all times. Some other possible uses of a CNAME record are to redirect all of the 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 example. The latter will work only by setting up a CNAME record for a subdomain simply because such a record set up for the main domain name renders it impossible to use e-mail addresses.