There are lots of ways to redirect a domain to another domain or subdomain and one of them is by creating a CNAME record. If you own a domain and you've created a site using some on-line service that provides you with a service subdomain, you can easily link the two by setting up a CNAME record for your-domain.com that directs to subdomain.provider.com. What you are going to achieve as a result is that www.your-domain.com is going to be in the web browser address bar while it opens the already mentioned site from the servers of the third-party provider. It is important to know that if you set up a CNAME record, any other records your domain name may have will stop functioning, so you can't have both a CNAME record directing to one company and working email addresses with another. The CNAME record is always an alpha string, not a number, and frequently additional configuration may be necessary with the other company.