Registering a domain and hosting one is usually mistaken by many people to be the same thing. They're in fact two separate services - the domain registration is the actual name and nothing more, while the hosted domains feature shows the number of already registered domain names you can accommodate in the same web hosting account and have website files and email messages for them. Your websites will function in precisely the same way no matter if 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 address without hosting it will give you ownership, but will not allow you to have a website if you don't host this domain name in some account so that records for it are created and it starts opening the content from that account.