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