Registering a domain and hosting one is commonly mistaken by many people to be the same thing. These are in fact 2 separate services - the domain name registration is the actual name and nothing more, while the hosted domains feature refers to the amount of already registered domains which you can accommodate within the same web hosting account and have website files and email messages for them. Your websites will work 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 without hosting it will give you ownership, but will not enable you to have a website if you don't host this domain address in some account so that records for it are created and it starts opening the content from that account.