Registering a domain and hosting one is commonly mistaken by many people to be the same thing. They're in fact two separate services - the domain registration is the actual name and nothing more, while the hosted domains feature refers to the number of already registered domain addresses that you can accommodate within the same website hosting account and have website files and email messages for them. Your sites will function in precisely 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 address without hosting it will give you ownership, but will not allow you to have a site if you don't host this domain in some account so that records for it are set up and it starts opening the information from that account.