Registering a domain name and hosting one is usually mistaken by a lot of people to be one and the same thing. They are in reality 2 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 addresses you can accommodate within the same web hosting account and have website data and email messages for them. Your sites will work in exactly the same way regardless if the domains are registered and hosted in one place or are registered with company A and directed to company B. Simply registering a domain 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.