The hosted domains feature of a website hosting account refers to the amount of registered domain names that one could add in the same account. Registering a domain name and hosting it are 2 different services although a lot of people consider them to be the same thing. While the registration means that you become the owner of a specific domain address, the hosting part is what actually allows you to have a web site because this is where your files and e-mails are going to be. Since these are 2 different services, you are able to register a new domain name 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 just as if it was registered and hosted with the same company. It is also extremely important to know that changing the hosting means pointing the domain address to another company and not transferring it.