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