Registering a domain and hosting one is usually mistaken by many people to be the same thing. They're in reality 2 separate services - the domain name registration is the actual name and nothing more, while the hosted domains feature shows the amount of already registered domain names that one could accommodate within the same web hosting account and have site data and e-mails for them. Your websites will function in precisely the same way regardless of whether the domains are registered and hosted in one place or are registered with company A and pointed to company B. Simply registering a domain without hosting it will give you ownership, but will not enable you to have a website until you host this domain name in some account so that records for it are created and it starts opening the information from that account.