If you want to direct a domain name that you have to another domain or subdomain, one of the ways to do that would be to use a CNAME record. By setting up such a record, the domain name being forwarded loses all its records (A, MX, etc) and instead, it takes the A record of the Internet domain it's pointed 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 forwarded to the site you have created, but it'll also be displayed in the web 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 provider by using webmail.your-doman.com, for instance. The latter will work only by creating a CNAME record for a subdomain since such a record set up for the main domain address renders it impossible to use email addresses.