Registering a domain name and hosting one is usually mistaken by a lot of people to be one and the same thing. These are in reality two separate services - the domain registration is the actual name and nothing more, while the hosted domains feature shows the amount of already registered domain addresses which you could accommodate in the same web hosting account and have site files and email messages for them. Your websites will function in exactly the same way regardless of whether 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 allow you to have a 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.