If you want to make a web site, you need two things - a domain and a hosting plan for it. The domain registration is the actual web address which you enter in a browser to access a site, while the hosting space is where your site data will be. These are 2 tightly connected, but independent services, although many people assume that registering the domain is enough. Similar to the disk space and the monthly traffic features which a given web hosting plan offers, 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 in fact registered via a different provider. In technical terms, it does not matter if a domain name is registered and hosted with the exact same company or is registered with one company and pointed to a different one - either way your websites will function exactly the same way.