In order to make a website, you need two things - a domain name and a web hosting plan for it. The domain registration is the actual website address which you enter in a browser to reach a site, while the hosting space is where your site data will be. These are 2 closely connected, yet independent services, while many people think that registering the domain is enough. Just like the disk space and the monthly traffic features which a given website hosting plan offers, there are a certain number of registered domain names you can add as hosted which means that you can have the web content for them in some account even if the domains are in fact registered via a different provider. In technical terms, it doesn't matter whether a domain is registered and hosted with the exact same company or is registered with one company and directed to a different one - in any case your sites will function in exactly the same way.