If you want to direct a domain that you have to another domain name or subdomain, one of the ways to do this would be to use a CNAME record. By setting up such a record, the domain being pointed loses all of its records (A, MX, and so forth) and instead, it takes the A record of the domain name it's redirected to. In this way, if you are using a web design service by some company that gives you a subdomain, you can use an actual domain and not only will it be pointed to the website which you have created, but it will also be displayed in the web browser address bar at all times. Other possible uses of a CNAME record are to direct all the visitors 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 since this kind of a record created for the main domain renders it impossible to use e-mail addresses.
