The hosted domains feature of a web hosting account indicates the amount of registered domains which you can include within the exact same account. Registering a domain name and hosting it are 2 different services even though many people consider them to be the exact same thing. While the registration means that you become the owner of a specific domain name, the hosting element is what really permits you to have a web site since this is where your data and emails will be. As these are two different services, you can register a new domain name with one company and host it with another by modifying its name servers (DNS) - the domain name will work in the exact same way just as if it was registered and hosted with the exact same company. It is also very important to know that changing the hosting means pointing the domain to an alternative company and not transferring it.