Registering a domain and hosting one is usually mistaken by many people to be the same thing. They are in fact 2 different services - the domain registration is the actual name and nothing else, while the hosted domains feature refers to the number of already registered domain addresses which you can accommodate in the same web hosting account and have site files and emails for them. Your websites will function in exactly the same way no matter 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 name without hosting it will grant you ownership, but will not enable you to have a web site until you host this domain address in some account so that records for it are created and it starts opening the information from that account.