If you'd like to forward a domain that you have to a different domain or subdomain, a good way to do this would be to use a CNAME record. By creating such a record, the domain name being redirected loses all of its records (A, MX, and so on) 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 name and not only will it be pointed to the site you have set up, but it will also be displayed in the web browser address bar at all times. Alternative possible uses of a CNAME record are to redirect all of the visitors from different 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 due to the fact that such a record created for the main domain makes it impossible to use email addresses.