There are several ways to redirect a domain to an alternative domain or subdomain and one of them is by setting up a CNAME record. When you own a domain name and you've created a website through some online service that provides you with a service subdomain, you can easily link the two by creating 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 will be in the web browser address bar while it opens the already mentioned site from the servers of the third-party company. You should know that if you set up a CNAME record, any other records your domain may have will stop working, so you can't have both a CNAME record directing to one provider and working email addresses with another. The CNAME record is always an alpha string, not a number, and often further configuration may be needed with the other company.