Registering a domain and hosting one is commonly mistaken by many people to be one and the same thing. These are in fact two separate services - the domain registration is the actual name and nothing else, while the hosted domains feature shows the amount of already registered domain addresses which you could accommodate within the same web hosting account and have site data and emails for them. Your websites 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 name 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.