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