Registering a domain and hosting one is usually mistaken by a lot of people to be the same thing. They are in reality two different services - the domain name registration is the actual name and nothing more, while the hosted domains feature reveals the number of already registered domain names you can accommodate within the same website hosting account and have website data and email messages for them. Your websites will function in exactly the same way regardless if the domains 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 name in some account so that records for it are set up and it starts opening the content from that account.