Registering a domain name and hosting one is commonly mistaken by a lot of people to be one and the same thing. They're in fact 2 separate services - the domain address registration is the actual name and nothing more, while the hosted domains feature shows the amount of already registered domain addresses you can accommodate in the same hosting account and have site data and email messages for them. Your websites will work in precisely the same way no matter if the domains are registered and hosted in one place or are registered with company A and pointed to company B. Simply registering a domain address without hosting it will grant you ownership, but will not allow you to have a site unless you host this domain in some account so that records for it are set up and it starts opening the data from that account.