The hosted domains feature of a website hosting account indicates the number of registered domain names that you could include within the 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, the hosting aspect is what actually permits you to have a web site considering that this is where your data and emails are going to be. Since these are two different services, you are able to register a new domain with one company and host it with another by modifying its name servers (DNS) - the domain name shall work in the exact same way just as if it was registered and hosted with the same company. It's also extremely important to know that changing the hosting means directing the domain name to another company and not transferring it.