If you want to point a domain that you have to another domain name or subdomain, a good way 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 on) and instead, it takes the A record of the domain it is directed to. That 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 directed to the Internet site you have set up, but it'll also be displayed in the Internet browser address bar at all times. Alternative possible uses of a CNAME record are to redirect all the visitors from different subdomains to their main domain name, or to use the webmail service of your hosting company by using webmail.your-doman.com, for example. The latter will work only by creating a CNAME record for a subdomain due to the fact that this type of a record set up for the main domain makes it impossible to use email addresses.