The hosted domains feature of a web hosting account refers to the amount of registered domain names that one could include within the same account. Registering a domain address and hosting it are 2 different services although some people consider them to be the very same thing. While the registration ensures that you become the owner of a specific domain address, the hosting aspect is what really permits you to have a site considering that this is where your data and emails will be. Since these are 2 separate 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 will work in the exact same way just as if it was registered and hosted with the exact same company. It is also very important to know that changing the hosting means pointing the domain to a different company and not transferring it.