Registering a domain name and hosting one is commonly mistaken by a lot of people to be the same thing. These are actually two separate 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 which you can accommodate in the same hosting account and have site data and email messages for them. Your sites will work in exactly the same way no matter if the domain addresses are registered and hosted at the same place or are registered with company A and directed to company B. Simply registering a domain without hosting it will give you ownership, but will not allow you to have a website until you host this domain name in some account so that records for it are set up and it starts opening the data from that account.