If you want 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 which you type in a web browser to access a website, while the hosting space is where your site files is going to be. These are two closely connected, but separate services, although many people believe that registering the domain is enough. Much like the disk space and the monthly traffic features which a given web hosting plan provides, there are a certain number of registered domains that you can include as hosted i.e. you can have the web content for them in some account even if the domains are actually registered using a different service provider. In technical terms, it does not matter whether a domain is registered and hosted using the same company or is registered with one company and directed to another - in any case your websites will operate in exactly the same way.