Registering a domain name and hosting one is usually mistaken by a lot of people to be one and the same thing. They're in fact two different services - the domain address registration is the actual name and nothing else, while the hosted domains feature reveals the amount of already registered domain addresses which you can accommodate in the same hosting account and have site data and emails for them. Your websites will work in exactly the same way no matter whether the domain names are registered and hosted at the same place or are registered with company A and directed to company B. Simply registering a domain name without hosting it will give you ownership, but will not enable you to have a site if you don't host this domain name in some account so that records for it are set up and it starts opening the information from that account.