Registering a domain name and hosting one is often mistaken by many people to be the same thing. They are actually 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 addresses you can accommodate in the same web hosting account and have website files and emails for them. Your sites will function in precisely the same way regardless if the domain addresses 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 enable you to have a web site if you don't host this domain address in some account so that records for it are created and it starts opening the information from that account.