Registering a domain name and hosting one is often mistaken by a lot of people to be the same thing. They are in fact 2 different services - the domain name registration is the actual name and nothing more, while the hosted domains feature refers to the number of already registered domain names which you can accommodate within the same hosting account and have website files and emails for them. Your websites will function in precisely the same way regardless if the domain addresses 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 allow you to have a website unless you host this domain name in some account so that records for it are created and it starts opening the content from that account.