If you'd like to point a domain that you have to some other domain address or subdomain, one of the ways to do that would be to use a CNAME record. By setting up such a record, the domain address being redirected loses all its records (A, MX, and so forth) and instead, it takes the A record of the domain it's redirected 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 site that you have created, but it'll also appear in the web browser address bar at all times. Other possible uses of a CNAME record are to redirect all of the traffic from various subdomains to their main domain, or to use the webmail service of your webhosting company by using webmail.your-doman.com, for instance. The latter will work only by creating a CNAME record for a subdomain because this type of a record created for the main domain name makes it impossible to use e-mail addresses.