The hosted domains feature of a website hosting account denotes the amount of registered domain names which you could add within the same account. Registering a domain address 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 specific domain name, the hosting part is what actually permits you to have a website as this is where your data and emails are going to be. Because these are 2 different services, it is possible to register a new domain with one company and host it with another one by modifying its name servers (DNS) - the domain name is going to work in the exact same way just as if it was registered and hosted using the same company. Additionally, it is very important to know that changing the hosting means pointing the domain address to a different company and not transferring it.