The hosted domains feature of a web hosting account refers to the number of registered domain names which you can add within the exact same account. Registering a domain address and hosting it are 2 completely different services although a lot of people consider them to be the same thing. While the registration signifies that you become the owner of a given domain name, the hosting aspect is what really allows you to have a web site as this is where your files and emails will be. Because these are 2 different services, it is possible to register a new domain name with one company and host it with another one by changing its name servers (DNS) - the domain will work in the exact same way just as if it was registered and hosted with the same company. It is also very important to know that changing the hosting means pointing the domain name to another company and not transferring it.