The hosted domains feature of a hosting account denotes the number of registered domains that one could include in the same account. Registering a domain and hosting it are 2 completely different services even though many people consider them to be the exact same thing. While the registration means you become the owner of a given domain address, the hosting part is what really allows you to have a website as this is where your files and email messages are going to be. As these are two independent services, it is possible to register a new domain with one company and host it with another by modifying 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 very important to know that changing the hosting means pointing the domain name to an alternative company and not transferring it.