The hosted domains feature of a website hosting account refers to the number of registered domain names that one could include within the very same account. Registering a domain name and hosting it are 2 different services even though many people consider them to be the same thing. While the registration ensures that you become the owner of a certain domain name, the hosting element is what in fact allows you to have a website since this is where your data and email messages are going to be. As these are 2 independent services, you can register a new domain with one company and host it with another one by modifying its name servers (DNS) - the domain is going to work in the exact same way just 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.