The hosted domains feature of a hosting account refers to the amount of registered domain names that you could include in the very same account. Registering a domain name and hosting it are 2 different services although some people consider them to be the same thing. While the registration ensures that you become the owner of a certain domain, the hosting element is what in fact allows you to have a website considering that this is where your files and e-mails are going to be. Since these are two independent services, it is possible to register a new domain with one company and host it with another one by changing its name servers (DNS) - the domain is going to work in the exact same way as if it was registered and hosted with the same company. Additionally, it is extremely important to know that changing the hosting means pointing the domain name to a different company and not transferring it.