If you want to point a domain name that you have to another domain name or subdomain, the best way to do this would be to use a CNAME record. By creating such a record, the domain being pointed loses all of its records (A, MX, etc) and instead, it takes the A record of the domain address it is pointed to. 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 website that you have set up, but it will also appear in the web browser address bar at all times. Alternative possible uses of a CNAME record are to forward all of the targeted traffic 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 example. The latter will work only by creating a CNAME record for a subdomain because this type of a record set up for the main domain address renders it impossible to use e-mail addresses.