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GRUB is the GRand Unified Bootloader, a BootLoader that can be used to boot most operating systems.

GRUB 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.

GRUB was initially developed by Erich Boleyn as part of work on booting the operating system GNU/Hurd, developed by the Free Software Foundation.