Registering a domain name and hosting one is usually mistaken by a lot of people to be the same thing. They are actually 2 different services - the domain address registration is the actual name and nothing more, while the hosted domains feature refers to the number of already registered domain addresses that you can accommodate in the same hosting account and have website data and emails for them. Your sites will work in exactly 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 give you ownership, but will not enable you to have a website until you host this domain address in some account so that records for it are created and it starts opening the information from that account.