If you wish to point a domain name that you have to a different domain name or subdomain, a good way to do this would be to use a CNAME record. By creating such a record, the domain being redirected loses all its records (A, MX, etc) and instead, it takes the A record of the domain address it's redirected to. This way, if you use a web design service by some provider that gives you a subdomain, you can use an actual domain name and not only will it be directed to the website that you've set up, but it'll also be displayed in the web browser address bar at all times. Alternative possible uses of a CNAME record are to forward all the traffic from various 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 setting up a CNAME record for a subdomain because this kind of a record set up for the main domain address renders it impossible to use e-mail addresses.