There are many ways to direct a domain address to an alternative domain or subdomain and one of them is by setting up a CNAME record. In case you own a domain and you've developed a site using some online 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 will achieve as a result is that www.your-domain.com is going to be in the 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 create a CNAME record, any other records your domain address may have will stop working, so you can't have both a CNAME record pointing to one company and working e-mail address with a different one. The CNAME record is always an alpha string, not a number, and sometimes more configuration may be needed with the other company.