The hosted domains feature of a hosting account denotes the number of registered domain names that one could add within the same account. Registering a domain address and hosting it are 2 totally different services although many people consider them to be the very same thing. While the registration signifies that you become the owner of a given domain name, the hosting part is what in fact permits you to have a website considering that this is where your data and e-mails are going to be. Since these are 2 separate services, you can register a new domain address with one company and host it with another one by changing its name servers (DNS) - the domain name shall work in the exact same way as if it was registered and hosted with the exact same company. It's also extremely important to know that changing the hosting means pointing the domain address to a different company and not transferring it.