Debian — Details of package grub-efi-amd64 in bookworm

GRand Unified Bootloader, version 2 (EFI-AMD64 version)

GRUB is a portable, powerful bootloader. This version of GRUB is based on a
cleaner design than its predecessors, and provides the following new features:

 - Scripting in grub.cfg using BASH-like syntax.
 - Support for modern partition maps such as GPT.
 - Modular generation of grub.cfg via update-grub.  Packages providing GRUB
   add-ons can plug in their own script rules and trigger updates by invoking
   update-grub.

This is a dependency package for a version of GRUB that has been built for
use with the EFI-AMD64 architecture, as used by Intel Macs (unless a BIOS
interface has been activated). Installing this package indicates that this
version of GRUB should be the active boot loader.