Registering a domain and hosting one is commonly mistaken by a lot of people to be the same thing. They are in fact two separate services - the domain name registration is the actual name and nothing more, while the hosted domains feature shows the amount of already registered domain names that you can accommodate in the same hosting account and have site files and emails for them. Your sites will function in precisely the same way no matter 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 address without hosting it will grant you ownership, but will not enable you to have a website unless 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.