There are lots of ways to redirect a domain address to an alternative domain or subdomain and one of them is by creating a CNAME record. In case you own a domain and you've developed a site using some online service which supplies you with a service subdomain, you could easily link the two by creating a CNAME record for your-domain.com that points to subdomain.provider.com. What you'll achieve as a result 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 company. It is very important to know that if you set up 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 functioning email addresses with another. The CNAME record is always an alpha string, not a number, and sometimes further configuration may be necessary with the other company.