The hosted domains feature of a hosting account indicates the amount of registered domains that you can include within the same account. Registering a domain name and hosting it are two totally 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 address, the hosting element is what in fact allows you to have a site since this is where your data and emails are going to be. Because these are 2 independent services, you'll be able to register a new domain address with one company and host it with another by changing its name servers (DNS) - the domain will work in the exact same way as if it was registered and hosted using the same company. Also, it is important to know that changing the hosting means pointing the domain address to an alternative company and not transferring it.