If you want to make a website, you need two things - a domain name and a web hosting plan for it. The domain registration is the actual web address that you type in a browser to access a site, while the hosting space is where your site files is going to be. These are two closely connected, but independent services, even though many people believe that registering the domain is enough. Just like the disk space and the monthly traffic features that 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 have been registered via a different company. In technical terms, it doesn't matter if a domain name is registered and hosted with the exact same company or is registered with one company and directed to a different one - in either case your websites will operate in exactly the same way.