If you want to make a website, you need 2 things - a domain and a hosting plan for it. The domain registration is the actual web address that you type in a browser to reach a website, while the hosting space is where your website data will be. These are two very closely related, but individual services, while many people assume that registering the domain is enough. Just like the disk space and the monthly traffic features that a given website hosting plan has, there are a certain number of registered domain names you can add 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 provider. In technical terms, it doesn't matter if a domain is registered and hosted using the same company or is registered with one company and directed to a different one - in either case your websites will operate the very same way.