The hosted domains feature of a hosting account denotes the amount of registered domain names which you can add in the same account. Registering a domain and hosting it are 2 different services even though many people consider them to be the same thing. While the registration means that you become the owner of a given domain address, the hosting element is what really allows you to have a website as this is where your files and e-mails 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 changing its name servers (DNS) - the domain name will work in the exact same way just as if it was registered and hosted with the same company. Additionally, it is important to know that changing the hosting means pointing the domain to a different company and not transferring it.