Registering a domain name and hosting one is usually mistaken by many people to be one and the same thing. They're in reality 2 separate services - the domain name registration is the actual name and nothing else, while the hosted domains feature shows the amount of already registered domains you can accommodate in the same web hosting account and have site files and emails for them. Your websites will function in exactly the same way no matter whether the domain addresses are registered and hosted in one place or are registered with company A and directed to company B. Simply registering a domain without hosting it will grant you ownership, but will not allow you to have a website if you don't host this domain name in some account so that records for it are set up and it starts opening the content from that account.