If you would like to point a domain that you have to another domain or subdomain, one way to do that would be to use a CNAME record. By creating such a record, the domain address being pointed loses all its records (A, MX, and so forth) and instead, it takes the A record of the domain it's forwarded to. In this way, if you are using a web design service by some provider that gives you a subdomain, you can use an actual domain name and not only will it be forwarded to the site you have created, but it will also appear in the browser address bar at all times. Some other possible uses of a CNAME record are to forward all the targeted traffic from various 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 creating a CNAME record for a subdomain simply because this type of a record created for the main domain name renders it impossible to use e-mail addresses.