Registering a domain and hosting one is often mistaken by many people to be the same thing. They're in fact 2 separate services - the domain name registration is the actual name and nothing more, while the hosted domains feature reveals the number of already registered domain addresses you can accommodate within the same website hosting account and have website data and emails for them. Your sites will function in exactly the same way regardless of whether the domain addresses 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 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 data from that account.