If you'd like to point a domain name 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 address being pointed loses all its records (A, MX, and so on) and instead, it takes the A record of the domain address it is 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 redirected to the website that you've 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 direct all the targeted traffic from different 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 simply because this type of a record created for the main domain name makes it impossible to use email addresses.