Registering a domain name and hosting one is commonly mistaken by a lot of people to be the same thing. They are actually two separate 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 that you can accommodate within the same web hosting account and have site data and email messages for them. Your sites will work in precisely the same way regardless if the domains 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 give you ownership, but will not allow you to have a web site unless you host this domain in some account so that records for it are created and it starts opening the data from that account.