Registering a domain name and hosting one is usually mistaken by a lot of people to be one and the same thing. They are in fact 2 separate services - the domain name registration is the actual name and nothing else, while the hosted domains feature refers to the amount of already registered domain names which you could accommodate within the same hosting account and have website data and emails for them. Your sites will function in exactly the same way regardless if the domain names are registered and hosted at the same place or are registered with company A and directed to company B. Simply registering a domain without hosting it will give you ownership, but will not enable 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 information from that account.