If you wish to make a website, you need two things - a domain and a web hosting plan for it. The domain registration is the actual web address that you type in a web browser to reach a website, while the hosting space is where your website files is going to be. These are 2 tightly connected, yet separate services, while many people assume that registering the domain is enough. Just like the disk space and the monthly traffic features that a given web hosting plan offers, there are a certain number of registered domains you can add as hosted i.e. you can have the web content for them in some account even when the domains are actually registered using a different provider. In technical terms, it does not matter if a domain is registered and hosted with the exact same company or is registered with one company and pointed to another - either way your sites will operate exactly the same way.