There are various ways to point a domain name to a different domain or subdomain and one of them is by creating a CNAME record. When you own a domain name and you have set up a site using some online service which provides you with a service subdomain, you can easily link the two by creating a CNAME record for your-domain.com that points to subdomain.provider.com. What you are going to achieve by doing this 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 address may have will stop working, so you can't have both a CNAME record pointing to one provider and functioning e-mail address with another. The CNAME record is always an alpha string, not a number, and frequently additional configuration may be needed with the other provider.