The hosted domains feature of a hosting account refers to the amount of registered domains that one could include in the exact same account. Registering a domain address and hosting it are two totally 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, the hosting part is what in fact allows you to have a web site considering that this is where your files and emails are going to be. As these are 2 independent services, you are able to 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 as if it was registered and hosted with the same company. It's also very important to know that changing the hosting means pointing the domain to a different company and not transferring it.