There are various ways to point a domain address to another domain or subdomain and one of them is by creating a CNAME record. If you own a domain and you have developed a site using some online service which supplies you with a service subdomain, you can easily link the two by creating a CNAME record for your-domain.com that redirects 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 site from the servers of the third-party company. You should know that if you create a CNAME record, any other records your domain may have will stop functioning, so you can't have both a CNAME record pointing to one provider and working email addresses with a different one. The CNAME record is always an alpha string, not a number, and in some cases further configuration may be required with the other provider.