Registering a domain and hosting one is frequently mistaken by many people to be one and the same thing. These are in fact 2 separate services - the domain name registration is the actual name and nothing else, while the hosted domains feature refers to the number of already registered domain addresses which you could accommodate in the same website hosting account and have website files and emails for them. Your sites will function in exactly the same way no matter whether the domain addresses are registered and hosted in one place or are registered with company A and directed to company B. Simply registering a domain name without hosting it will give you ownership, but will not enable you to have a website unless you host this domain in some account so that records for it are created and it starts opening the data from that account.