GRUB

Short for GRand Unified Bootloader, GRUB is a bootloader used for various Linux and other Unix-like operating systems. It resides on a primary disk partition. Like all bootloaders, GRUB is responsible for loading the operating system after POST (Power-On Self-Test).

GRUB is developed and maintained by the GNU (GNU's Not Unix) project.

Computer acronyms, Dual-boot, LILO, Operating system terms