Registering a domain name and hosting one is usually mistaken by a lot of people to be the same thing. They are actually 2 separate services - the domain name registration is the actual name and nothing else, while the hosted domains feature reveals the amount of already registered domain addresses which you could accommodate within the same web hosting account and have website data and e-mails for them. Your sites will function in exactly the same way regardless 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 address without hosting it will grant you ownership, but will not allow you to have a site until you host this domain in some account so that records for it are created and it starts opening the information from that account.