The hosted domains feature of a web hosting account indicates the amount of registered domains that you can include within the exact same account. Registering a domain and hosting it are 2 completely different services although a lot of people consider them to be the exact same thing. While the registration signifies that you become the owner of a given domain, the hosting aspect is what really allows you to have a web site because this is where your files and e-mails will be. Since these are two separate services, you'll be able to register a new domain with one company and host it with another one by modifying 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. Also, it is extremely important to know that changing the hosting means directing the domain name to an alternative company and not transferring it.