If you'd like to point a domain address that you have to a different domain or subdomain, one way to do that would be to use a CNAME record. By creating such a record, the domain name being pointed loses all its records (A, MX, and so forth) and instead, it takes the A record of the domain address it's directed to. That way, if you are using 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 website you have set up, but it'll also appear in the web browser address bar at all times. Some other possible uses of a CNAME record are to point all the visitors from various subdomains to their main domain address, or to use the webmail service of your hosting company by using webmail.your-doman.com, for example. The latter will work only by setting up a CNAME record for a subdomain simply because this type of a record set up for the main domain address makes it impossible to use e-mail addresses.