GRUB Disk

GRUB Disk package contains a GRUB rescue disk.

It consists of a bootable 1.44 floppy image you can use to grab a rescue disk or be run in an i386 emulator, like Bochs.

GNU GRUB is a Multiboot boot loader. It was derived from GRUB,

GRand Unified Bootloader, which was originally designed and implemented by Erich Stefan Boleyn.

Briefly, boot loader is the first software program that runs when a computer starts. It is responsible for loading and transferring control to the operating system kernel software (such as the Hurd or the Linux). The kernel, in turn, initializes the rest of the operating system (e.g. GNU).