There are several ways to point a domain address to another domain or subdomain and one of them is by setting up a CNAME record. If you own a domain name and you've created a website through some on-line service that provides you with a service subdomain, you could easily link the two by setting up a CNAME record for your-domain.com that points to subdomain.provider.com. What you are going to achieve with this is that www.your-domain.com is going to be in the browser address bar while it opens the already mentioned website from the servers of the third-party company. It is important to know that if you create a CNAME record, any other records your domain address may have will stop functioning, so you can't have both a CNAME record directing to one provider and functioning e-mail address 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 company.