There are various ways to redirect a domain to an alternative domain or subdomain and one of them is by setting up a CNAME record. When you own a domain and you've created a site using some online service which 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're going to achieve with this 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 pointing to one company and working e-mail address with another. The CNAME record is always an alpha string, not a number, and frequently further configuration may be required with the other provider.