Registering a domain and hosting one is often mistaken by many people to be one and the same thing. They're in fact two different services - the domain name registration is the actual name and nothing else, while the hosted domains feature refers to the number of already registered domain names that you can accommodate within the same website hosting account and have site data and emails for them. Your sites will work in exactly the same way no matter whether 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 address without hosting it will grant you ownership, but will not allow you to have a site unless you host this domain address in some account so that records for it are set up and it starts opening the information from that account.
