There are lots of ways to redirect a domain name to another domain or subdomain and one of them is by setting up a CNAME record. If you own a domain and you've developed 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 points to subdomain.provider.com. What you're going to achieve by doing this is that www.your-domain.com is going to be in the web browser address bar while it opens the already mentioned website from the servers of the third-party provider. You should 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 provider and functioning email addresses with another. The CNAME record is always an alpha string, not a number, and in some cases more configuration may be required with the other company.