If you'd like to direct a domain that you have to another domain or subdomain, one way to do this would be to use a CNAME record. By setting up such a record, the domain being redirected loses all its records (A, MX, and so on) and instead, it takes the A record of the domain address it is redirected 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 pointed to the website you have created, but it'll also be displayed in the web browser address bar at all times. Other possible uses of a CNAME record are to direct all of 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 setting up a CNAME record for a subdomain due to the fact that this type of a record set up for the main domain name renders it impossible to use e-mail addresses.