The hosted domains feature of a web hosting account denotes the amount of registered domains that you can include in the same account. Registering a domain name and hosting it are two completely different services although some people consider them to be the very same thing. While the registration means you become the owner of a certain domain name, the hosting aspect is what really enables you to have a web site considering that this is where your data and emails will be. Because these are two different services, you can register a new domain name with one company and host it with another one by changing its name servers (DNS) - the domain address shall work in the exact same way just as if it was registered and hosted with the exact same company. It is also extremely important to know that changing the hosting means pointing the domain to an alternative company and not transferring it.