Registering a domain and hosting one is commonly mistaken by a lot of people to be the same thing. They're actually two different services - the domain address 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 website hosting account and have website data and emails for them. Your sites will function in exactly the same way no matter whether the domain names are registered and hosted in one place or are registered with company A and directed to company B. Simply registering a domain address without hosting it will give you ownership, but will not enable you to have a 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.