There are lots of ways to direct a domain name to another domain or subdomain and one of them is by creating a CNAME record. In case you own a domain name and you've set up a website through some online service which 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're going to achieve by doing this 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 very important to know that if you create a CNAME record, any other records your domain may have will stop functioning, so you cannot have both a CNAME record pointing to one company and functioning email addresses with another. The CNAME record is always an alpha string, not a number, and sometimes further configuration may be required with the other company.