The hosted domains feature of a website hosting account denotes the amount of registered domains which you can add in the same account. Registering a domain address and hosting it are two totally different services although many people consider them to be the exact same thing. While the registration means you become the owner of a given domain name, the hosting aspect is what in fact allows you to have a web site considering that this is where your files and e-mails will be. As these are two 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 name is going to work in the exact same way just as if it was registered and hosted using the same company. It's also very important to know that changing the hosting means pointing the domain name to an alternative company and not transferring it.