GNU GRUB
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![GNU GRUB on a MBR-partitioned hard drive; stage 1 (boot.img) can alternatively be written into one of the VBRs.](/Images/godic/202501/26/GNU_GRUB_on_MBR_partitioned_hard_disk_drives.svg3938.png")
GNU GRUB (short for GNU GRand Unified Bootloader) is a boot loader package from the GNU Project. GRUB is the reference implementation of the Free Software Foundation's Multiboot Specification, which provides a user the choice to boot one of multiple operating systems installed on a computer or select a specific kernel configuration available on a particular operating system's partitions.