If you want to make a website, you need 2 things - a domain name and a hosting plan for it. The domain registration is the actual website address which you type in a browser to access a site, while the hosting space is where your site data is going to be. These are two tightly connected, but individual services, even though many people assume that registering the domain is enough. Just like the disk space and the monthly traffic features which a given website hosting plan provides, there are a certain number of registered domain names which you can include 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 company. In technical terms, it doesn't matter if a domain name is registered and hosted with the same company or is registered with one company and pointed to a different one - in any case your websites will operate the very same way.