In order to make a web site, you need two things - a domain name and a hosting plan for it. The domain registration is the actual website address which you type in a web browser to reach a website, while the hosting space is where your site data will be. These are two very closely related, yet independent services, while many people assume that registering the domain name is enough. Very similar to the disk space and the monthly traffic features which a given website hosting plan offers, there are a certain number of registered domains that you can add as hosted i.e. you can have the web content for them in some account even if the domains are actually registered via a different service provider. In technical terms, it doesn't matter whether a domain is registered and hosted using the same company or is registered with one company and pointed to a different one - in any case your sites will function exactly the same way.