The hosted domains feature of a web hosting account denotes the number of registered domain names that you could add within the exact same account. Registering a domain and hosting it are two completely different services even though many people consider them to be the same thing. While the registration means you become the owner of a certain domain, the hosting element is what actually allows you to have a site considering that this is where your files and email messages will be. Because these are two different services, you are able to register a new domain name 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 using the same company. It's also important to know that changing the hosting means pointing the domain address to a different company and not transferring it.