In order to make a web site, you need 2 things - a domain and a hosting plan for it. The domain registration is the actual website address that you enter in a browser to access a website, while the hosting space is where your site files will be. These are two closely related, but independent services, while many people think that registering the domain is enough. Similar to the disk space and the monthly traffic features that a given hosting plan has, there are a certain number of registered domain names you can include as hosted i.e. you can have the web content for them in some account even when the domains are in fact registered using a different service provider. In technical terms, it does not matter whether a domain is registered and hosted with the same company or is registered with one company and directed to a different one - either way your sites will operate the very same way.