Registering a domain name and hosting one is frequently mistaken by many people to be one and the same thing. They are in fact 2 different services - the domain registration is the actual name and nothing more, while the hosted domains feature reveals the amount of already registered domain names you can accommodate within the same web hosting account and have site files and emails for them. Your websites will function in exactly the same way no matter whether the domain names 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 enable you to have a site 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.