If you'd like to point a domain that you have to a different domain name or subdomain, the best 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 forth) and instead, it takes the A record of the domain it is directed to. By doing this, if you use a web design service by some company that gives you a subdomain, you can use an actual domain and not only will it be forwarded to the site you have created, but it will also be displayed in the browser address bar at all times. Alternative possible uses of a CNAME record are to forward 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 because this kind of a record set up for the main domain name renders it impossible to use email addresses.