Registering a domain and hosting one is often mistaken by a lot of people to be one and the same thing. They're in reality two different services - the domain name registration is the actual name and nothing more, while the hosted domains feature shows the number of already registered domain addresses that you can accommodate in the same hosting account and have site files and e-mails for them. Your sites will work in exactly the same way no matter if the domain names are registered and hosted at the same place or are registered with company A and directed to company B. Simply registering a domain name without hosting it will give you ownership, but will not enable you to have a site until you host this domain name in some account so that records for it are set up and it starts opening the information from that account.