A Host name is required to assign a unique name to your VPS. Every computer has a name (called host-name). Often, this will actually be a real DNS name, but technically it can be anything.
For example, you own the AccuWebHosting.com, so it is always common for you to pick a host-name using it, for example, you may choose vps.accuwebhosting.com as your host-name.
If you do not own a domain name or just do not care, you can technically enter anything that's a valid host-name. For example, you could enter"vps.yourname.com".
The host nameservers can be easily changed after the installation, if you ever desire so.
