Registering a domain name and hosting one is commonly mistaken by many people to be one and the same thing. They are in fact two different services - the domain address registration is the actual name and nothing more, while the hosted domains feature refers to the amount of already registered domains that you can accommodate in the same website hosting account and have website data and emails for them. Your websites will work in exactly the same way no matter if the domain names are registered and hosted at the same 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 enable you to have a web site until you host this domain address in some account so that records for it are set up and it starts opening the content from that account.