There are lots of ways to redirect a domain address to an alternative domain or subdomain and one of them is by setting up a CNAME record. If you own a domain and you've developed a site through some online 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 directs to subdomain.provider.com. What you are going to achieve as a result is that www.your-domain.com is going to be in the web 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 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 company and working email addresses with another one. The CNAME record is always an alpha string, not a number, and often additional configuration may be necessary with the other company.