Registering a domain name and hosting one is usually mistaken by many people to be the same thing. These are in fact 2 separate services - the domain address registration is the actual name and nothing more, while the hosted domains feature shows the number of already registered domains that you can accommodate within the same website hosting account and have site data and email messages for them. Your sites will work in precisely the same way regardless 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 address without hosting it will give you ownership, but will not enable you to have a site unless you host this domain address in some account so that records for it are set up and it starts opening the data from that account.