Registering a domain name and hosting one is often mistaken by a lot of people to be one and the same thing. They're in fact 2 different services - the domain name registration is the actual name and nothing else, while the hosted domains feature reveals the amount of already registered domains that one could accommodate within the same web hosting account and have website data and e-mails for them. Your websites will function in precisely the same way no matter whether the domains are registered and hosted at the same 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 web site until you host this domain in some account so that records for it are set up and it starts opening the content from that account.