Explain the step-by-step Linux boot sequence.

Q: Explain the step-by-step Linux boot sequence.

> 1. **BIOS/UEFI**: Performs POST (Power-On Self-Test) and executes the bootloader from disk. 2. **GRUB Bootloader**: Loads the kernel and `initramfs` (initial RAM disk) into memory. 3. **Kernel**: Mounts the real root partition, initializes hardware drivers, and spawns the initialization daemon `/sbin/init` (PID `1`). 4. **Systemd**: Starts services concurrently to reach the multi-user execution state.

💬Answer

BIOS/UEFI: Performs POST (Power-On Self-Test) and executes the bootloader from disk.
GRUB Bootloader: Loads the kernel and initramfs (initial RAM disk) into memory.
Kernel: Mounts the real root partition, initializes hardware drivers, and spawns the initialization daemon /sbin/init (PID 1).
Systemd: Starts services concurrently to reach the multi-user execution state.

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