In order to make a web site, you need two 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 website, while the hosting space is where your website data will be. These are two very closely connected, yet individual services, even though many people think that registering the domain is enough. Just like the disk space and the monthly traffic features that a given web hosting plan has, 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 through a different company. In technical terms, it doesn't matter whether a domain name is registered and hosted with the same company or is registered with one company and directed to another one - in either case your websites will function the very same way.