If you want to point a domain that you have to some other domain name or subdomain, one way to do this would be to use a CNAME record. By creating such a record, the domain name being pointed loses all of its records (A, MX, and so forth) and instead, it takes the A record of the domain address it is directed to. In this way, if you use 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 directed to the site that you've set up, but it'll also appear in the browser address bar at all times. Other possible uses of a CNAME record are to point all of the targeted traffic from various subdomains to their main domain address, or to use the webmail service of your webhosting company by using webmail.your-doman.com, for example. The latter will work only by creating a CNAME record for a subdomain because this type of a record created for the main domain name makes it impossible to use email addresses.