Registering a domain name and hosting one is often mistaken by a lot of people to be one and the same thing. They are in fact 2 different services - the domain registration is the actual name and nothing else, while the hosted domains feature reveals the amount of already registered domains that you can accommodate within the same hosting account and have website files and emails for them. Your websites will work 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 without hosting it will give you ownership, but will not allow you to have a site until you host this domain in some account so that records for it are set up and it starts opening the content from that account.