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