Registering a domain and hosting one is usually mistaken by many people to be one and the same thing. These are in fact two separate 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 web hosting account and have website files and emails for them. Your websites will work in exactly the same way regardless of whether the domain names are registered and hosted in one place or are registered with company A and pointed to company B. Simply registering a domain without hosting it will give you ownership, but will not enable you to have a web site if you don't host this domain name in some account so that records for it are set up and it starts opening the content from that account.