Registering a domain and hosting one is often mistaken by many people to be the same thing. They are actually two separate services - the domain name registration is the actual name and nothing more, while the hosted domains feature shows the amount of already registered domain names that one could accommodate within the same website hosting account and have site data and e-mails for them. Your sites will work in precisely the same way no matter whether the domain addresses 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 web site until you host this domain name in some account so that records for it are created and it starts opening the information from that account.