If you want to point a domain address that you have to some other domain or subdomain, one way to do this would be to use a CNAME record. By setting up such a record, the domain address being redirected loses all of its records (A, MX, and so forth) and instead, it takes the A record of the domain name it's directed 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 pointed to the website that you've created, 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 direct all of the 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 this kind of a record created for the main domain makes it impossible to use e-mail addresses.