wtf is x86_64-grub?

This repo hosts a version of GRUB 2, which stands for the Grand Unified Bootloader. A bootloader is a small but critical piece of software that runs the moment you turn on a computer. Its job is to locate your operating system, load it into the computer's memory, and hand off control so the OS can start up normally. Without a bootloader, your computer would not know how to launch its own operating system. GRUB is an extremely common bootloader used primarily by Linux systems. This specific repository is a fork or customized copy of the GRUB source code, tailored with a focus on x86_64 architecture. The project is a complete rewrite of the original GRUB (now called GRUB Legacy), designed to be safer, more robust, and more portable across different types of hardware. The README itself does not go into detail about what specific x86_64 modifications were made, but it serves as the underlying codebase for building and installing the bootloader. People who build their own operating systems from scratch, or those working on low-level system software, are the primary users of this project. When you create a custom OS, you need a way for standard PC hardware to find and run your code. Instead of writing a bootloader entirely from scratch, developers can use this GRUB codebase as a reliable starting point to handle the complex early stages of booting, allowing them to focus on building the actual operating system. The main tradeoff of using GRUB is that it is a large, mature, and complex project originally written in C. While it is highly capable and handles a vast array of hardware scenarios, it can be heavy for simple custom projects. However, the README points users to its built-in documentation and change logs, and relying on an established tool like this saves developers from reinventing the deeply technical wheel of hardware initialization.