If you wish to make a web site, you need 2 things - a domain name and a web hosting plan for it. The domain registration is the actual website address that you type in a web browser to access a site, while the hosting space is where your site data is going to be. These are two very closely related, yet separate services, although many people believe that registering the domain name is enough. Similar to the disk space and the monthly traffic features that a given 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 if the domains have been registered through a different company. In technical terms, it doesn't matter whether 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 sites will function exactly the same way.