Registering a domain name and hosting one is sometimes mistaken by many people to be the same thing. They are actually two different services - the domain address registration is the actual name and nothing else, while the hosted domains feature refers to the amount of already registered domain addresses you can accommodate in the same web hosting account and have site files and emails for them. Your sites will work in precisely the same way no matter if 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 allow you to have a site unless you host this domain in some account so that records for it are created and it starts opening the content from that account.