Registering a domain and hosting one is sometimes mistaken by many people to be the same thing. They're in fact 2 separate services - the domain address registration is the actual name and nothing else, while the hosted domains feature reveals the amount of already registered domains which you could accommodate in the same web hosting account and have site data and email messages 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 directed to company B. Simply registering a domain without hosting it will grant you ownership, but will not enable you to have a site until you host this domain address in some account so that records for it are set up and it starts opening the data from that account.