If you want to point a domain address that you have to some other domain name or subdomain, a good way to do that would be to use a CNAME record. By setting up such a record, the domain being redirected loses all of its records (A, MX, and so forth) and instead, it takes the A record of the domain it is pointed to. That 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 redirected to the website which you have set up, but it'll also be displayed in the browser address bar at all times. Alternative possible uses of a CNAME record are to forward all of the targeted traffic from different subdomains to their main Internet domain, or to use the webmail service of your webhosting company by using webmail.your-doman.com, for example. The latter will work only by setting up a CNAME record for a subdomain because such a record set up for the main domain renders it impossible to use email addresses.