The hosted domains feature of a website hosting account refers to the amount of registered domain names that you could add in the very same account. Registering a domain address and hosting it are 2 completely different services although some people consider them to be the same thing. While the registration means you become the owner of a specific domain, the hosting aspect is what really permits you to have a website because this is where your data and e-mails will be. Because these are two different services, you can register a new domain address with one company and host it with another by changing its name servers (DNS) - the domain shall work in the exact same way just as if it was registered and hosted with the same company. Also, it is important to know that changing the hosting means directing the domain to a different company and not transferring it.