Registering a domain and hosting one is usually mistaken by a lot of people to be one and the same thing. They're in reality 2 different services - the domain registration is the actual name and nothing more, while the hosted domains feature reveals the amount of already registered domain addresses that you can accommodate in the same hosting account and have site files and email messages for them. Your sites will function in exactly 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 grant you ownership, but will not enable you to have a website until you host this domain name in some account so that records for it are set up and it starts opening the information from that account.