The hosted domains feature of a hosting account refers to the amount of registered domain names which you could include in the same account. Registering a domain address and hosting it are 2 different services even though many people consider them to be the exact same thing. While the registration means you become the owner of a given domain address, the hosting aspect is what in fact allows you to have a site as this is where your data and email messages are going to be. Since these are two separate services, you can register a new domain name with one company and host it with another by modifying its name servers (DNS) - the domain name shall work in the exact same way as if it was registered and hosted using the same company. It is also very important to know that changing the hosting means directing the domain name to another company and not transferring it.