Registering a domain name and hosting one is usually mistaken by many people to be the same thing. They're in fact 2 separate services - the domain registration is the actual name and nothing more, while the hosted domains feature refers to the amount of already registered domain names that you can accommodate in the same hosting account and have website data and email messages for them. Your sites will function in precisely the same way regardless if the domain addresses are registered and hosted in one place or are registered with company A and pointed 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 name in some account so that records for it are set up and it starts opening the information from that account.