If you'd like to point a domain that you have to another domain address or subdomain, one of the ways to do this would be to use a CNAME record. By setting up such a record, the domain being pointed loses all its records (A, MX, etc) and instead, it takes the A record of the Internet domain it's forwarded 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 and not only will it be directed to the site that you've set up, but it will also appear in the web browser address bar at all times. Some other possible uses of a CNAME record are to direct all of the targeted traffic from different subdomains to their main domain address, or to use the webmail service of your hosting provider by using webmail.your-doman.com, for instance. The latter will work only by creating a CNAME record for a subdomain due to the fact that such a record set up for the main domain renders it impossible to use e-mail addresses.