The hosted domains feature of a hosting account denotes the number of registered domains which you can add within the same account. Registering a domain address and hosting it are two completely different services although some people consider them to be the exact same thing. While the registration ensures that you become the owner of a specific domain name, the hosting aspect is what really enables you to have a web site since this is where your data and e-mails will be. As these are 2 different services, you can register a new domain address with one company and host it with another one 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 exact same company. Additionally, it is extremely important to know that changing the hosting means pointing the domain name to an alternative company and not transferring it.