If you want to point a domain name that you have to another domain name or subdomain, one of the ways to do that would be to use a CNAME record. By setting up such a record, the domain being pointed loses all its records (A, MX, and so on) and instead, it takes the A record of the domain address it's pointed to. By doing this, if you are using a web design service by some provider that gives you a subdomain, you can use an actual domain and not only will it be directed to the site that you have set up, but it will also be displayed in the web browser address bar at all times. Alternative possible uses of a CNAME record are to forward all the traffic 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 because this type of a record set up for the main domain name renders it impossible to use e-mail addresses.