There are lots of ways to direct a domain address to another domain or subdomain and one of them is by setting up a CNAME record. If you own a domain and you have created a website using some on-line service which supplies you with a service subdomain, you could easily link the two by setting up a CNAME record for your-domain.com that points to subdomain.provider.com. What you'll achieve in this way is that www.your-domain.com will be in the browser address bar while it opens the already mentioned website from the servers of the third-party provider. You should know that if you create a CNAME record, any other records your domain may have will stop functioning, so you cannot have both a CNAME record pointing to one provider and functioning email addresses with a different one. The CNAME record is always an alpha string, not a number, and sometimes further configuration may be needed with the other company.