There are lots of ways to point a domain to an alternative domain or subdomain and one of them is by setting up a CNAME record. In case you own a domain name and you have set up a site using some online service that provides you with a service subdomain, you could easily link the two by creating a CNAME record for your-domain.com that redirects to subdomain.provider.com. What you'll achieve with this is that www.your-domain.com is going to be in the Internet browser address bar while it opens the already mentioned Internet site 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 working, so you can't have both a CNAME record pointing to one company and working email addresses with a different one. The CNAME record is always an alpha string, not a number, and frequently more configuration may be required with the other provider.