There are many ways to redirect a domain name to another domain or subdomain and one of them is by creating a CNAME record. When you own a domain name and you have created a site using some on-line service which provides you with a service subdomain, you could easily link the two by creating a CNAME record for your-domain.com that directs to subdomain.provider.com. What you will achieve with this is that www.your-domain.com will be in the web browser address bar while it opens the already mentioned website from the servers of the third-party company. You should know that if you create 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 working email addresses with another one. The CNAME record is always an alpha string, not a number, and in some cases more configuration may be needed with the other company.