Registering a domain and hosting one is sometimes mistaken by a lot of people to be the same thing. These are actually two separate services - the domain registration is the actual name and nothing more, while the hosted domains feature reveals the number of already registered domains which you could accommodate in the same hosting account and have website data and e-mails for them. Your websites will work in precisely the same way regardless if the domain addresses are registered and hosted at the same 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 allow you to have a web site if you don't host this domain name in some account so that records for it are created and it starts opening the content from that account.