Registering a domain name and hosting one is often mistaken by a lot of people to be the same thing. These are in reality two separate services - the domain address registration is the actual name and nothing more, while the hosted domains feature refers to the amount of already registered domain names you can accommodate within the same website hosting account and have website data and e-mails for them. Your websites will work in precisely 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 grant 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 content from that account.