If you want to direct a domain address that you have to some other domain name or subdomain, one of the ways to do this would be to use a CNAME record. By creating 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 it is redirected to. In this way, if you use a web design service by some company that gives you a subdomain, you can use an actual domain and not only will it be forwarded to the site that you have created, but it'll also be displayed in the browser address bar at all times. Other possible uses of a CNAME record are to direct 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 due to the fact that this kind of a record created for the main domain renders it impossible to use email addresses.