The '''Grub bootloader''' is a package that is used to boot various operating systems via a menu upon computer system boot-up.

== How the Grub Bootloader Works ==

When the computer system starts, the computer's BIOS locates and runs the bootstrap program on the MBR (Master Boot Record). A series of programs (of Grub) are run provide the user a selection of operating system to choose to boot into. For example, the user can select a version of Linux to load the Linux Kernel, or the user can select another operating system (like Windows) to load in the boot-loader (eg. NTLDR). This process of loading boot loaders for other operating systems than Linux is referred to as '''chainloading'''.

== Why Edit the Grub Bootloader? ==