In order to make a website, you need 2 things - your own domain and a web hosting plan for it. The domain registration is the actual web address which you type in a browser to access a website, while the hosting space is where your site files will be. These are two closely related, yet separate services, although many people think that registering the domain name is enough. Much like the disk space and the monthly traffic features which a given web hosting plan has, there are a certain number of registered domains that you can include as hosted which means that you can have the web content for them in some account even if the domains are in fact registered via a different company. In technical terms, it doesn't matter if a domain is registered and hosted using the same company or is registered with one company and pointed to another one - either way your websites will function in exactly the same way.