Registering a domain and hosting one is frequently mistaken by a lot of people to be the same thing. They're actually 2 different services - the domain address registration is the actual name and nothing more, while the hosted domains feature refers to the number of already registered domains which you could accommodate within the same web hosting account and have site files and e-mails for them. Your websites will function in precisely 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 address without hosting it will give you ownership, but will not enable you to have a website unless you host this domain address in some account so that records for it are set up and it starts opening the content from that account.