The hosted domains feature of a web hosting account denotes the amount of registered domain names that you can add within the exact same account. Registering a domain name and hosting it are 2 different services although a lot of people consider them to be the exact same thing. While the registration means you become the owner of a certain domain name, the hosting aspect is what actually enables you to have a web site as this is where your files and e-mails are going to be. As these are two independent 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 shall work in the exact same way just as if it was registered and hosted using the same company. Also, it is extremely important to know that changing the hosting means pointing the domain name to a different company and not transferring it.