Whats that of delegating?
Once you have your domain name (and your IP number), and the IP number(s) and name of your virtual hosting ISP, you need to tell someone about this. In fact, you tell the national Internet authority from which you got the domain name. That national authority will enable the association between your name and IP number to your hosting ISP. It’s like having a mailbox at certain branch of the post office assigned to your name.