The hosted domains feature of a hosting account denotes the number of registered domains that you can include within the same account. Registering a domain and hosting it are 2 different services although many people consider them to be the same thing. While the registration means you become the owner of a given domain name, the hosting part is what actually permits you to have a site since 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 address with one company and host it with another by modifying its name servers (DNS) - the domain address will work in the exact same way as if it was registered and hosted using the same company. Also, it is extremely important to know that changing the hosting means directing the domain address to another company and not transferring it.