Registering a domain name and hosting one is commonly mistaken by many people to be one and the same thing. They're actually two different services - the domain name registration is the actual name and nothing else, while the hosted domains feature shows the amount of already registered domain names which you could accommodate within the same website hosting account and have website data and emails for them. Your sites will function in exactly the same way no matter 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 without hosting it will give you ownership, but will not allow you to have a website until you host this domain in some account so that records for it are set up and it starts opening the data from that account.