Registering a domain and hosting one is commonly mistaken by a lot of people to be the same thing. They are in reality 2 separate services - the domain name registration is the actual name and nothing else, while the hosted domains feature reveals the number of already registered domains that one could accommodate in the same website hosting account and have site 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 directed to company B. Simply registering a domain address without hosting it will give you ownership, but will not enable you to have a website if you don't host this domain in some account so that records for it are created and it starts opening the data from that account.