Registering a domain name and hosting one is commonly mistaken by a lot of people to be the same thing. These are actually two different services - the domain registration is the actual name and nothing more, while the hosted domains feature refers to the number of already registered domain names which you can accommodate within the same web hosting account and have website data and emails for them. Your sites will function in precisely the same way no matter if the domains 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 grant you ownership, but will not allow you to have a site unless you host this domain name in some account so that records for it are set up and it starts opening the data from that account.