The hosted domains feature of a website hosting account indicates the number of registered domains which you could add in the very same account. Registering a domain and hosting it are 2 totally different services although a lot of people consider them to be the very same thing. While the registration ensures that you become the owner of a specific domain, the hosting part is what actually allows you to have a web site because this is where your files and email messages will be. As these are two separate services, it is possible to register a new domain with one company and host it with another one by modifying its name servers (DNS) - the domain address shall work in the exact same way as if it was registered and hosted with the exact same company. Also, it is very important to know that changing the hosting means pointing the domain name to a different company and not transferring it.