Registering a domain and hosting one is usually mistaken by many people to be the same thing. They are in reality two separate services - the domain name registration is the actual name and nothing else, while the hosted domains feature reveals the amount of already registered domains you can accommodate within the same hosting account and have website files and email messages for them. Your websites will work in precisely the same way regardless if the domain addresses are registered and hosted in one place or are registered with company A and pointed to company B. Simply registering a domain name without hosting it will grant you ownership, but will not allow you to have a site if you don't host this domain in some account so that records for it are created and it starts opening the data from that account.
