The first part of GRUB (GRand Unified Bootloader) is to resides on the MBR/GT.
The term grub is known as GRand Unified Bootloader. GRUB (GRand Unified Bootloader is known to be a kind of boot loader package.
It was said to be developed so as to aid a lot of (multiple) operating systems and it is one that helps the user to select among them when they are in boot-up.
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