The hosted domains feature of a web hosting account denotes the number of registered domain names that you can add in the very same account. Registering a domain and hosting it are 2 completely different services although some people consider them to be the very same thing. While the registration means you become the owner of a certain domain, the hosting part is what really enables you to have a web site since this is where your files and emails will be. Since these are 2 separate services, you can register a new domain name with one company and host it with another by changing its name servers (DNS) - the domain address is going to work in the exact same way as if it was registered and hosted with the same company. Also, it is extremely important to know that changing the hosting means directing the domain name to another company and not transferring it.