Device drivers act as translators that allow the operating system and hardware devices to communicate effectively.

Firmware like BIOS or UEFI is stored in non-volatile memory such as Flash memory or ROM so that it remains intact when the power is turned off.

The Power-On Self-Test is a diagnostic testing sequence that the computer's firmware runs to verify that the hardware is working correctly.

UEFI (Unified Extensible Firmware Interface) replaced BIOS, offering improved security, faster boot speeds, and support for large capacity storage drives.

CMOS (Complementary Metal-Oxide-Semiconductor) stores the configuration data, such as system time and hardware boot order, that the BIOS/UEFI accesses.

Without the correct device driver, the operating system does not know how to interpret signals from or send commands to the hardware component.

Firmware is a specific class of computer software that provides low-level control for a device's specific hardware.

The BIOS/UEFI is the first code executed by the CPU upon startup to identify and initialize system devices.

Controllers in devices like SSDs, routers, and graphic cards often have firmware that can be updated to fix bugs or add new features.

Device Manager is the primary Windows utility for viewing and controlling the hardware attached to the computer, including updating or rolling back drivers.

Secure Boot is a security standard designed to ensure that a device boots using only software that is trusted by the Original Equipment Manufacturer (OEM).

CMOS (Complementary Metal-Oxide-Semiconductor) memory holds the BIOS settings; it is powered by a small battery when the computer is off.

The bootstrap loader is a small program in the BIOS/UEFI that finds the OS bootloader on the storage drive and hands over control to it.

Kernel-mode drivers run in Ring 0, the highest privilege level, allowing them direct access to hardware and system memory.

ACPI (Advanced Configuration and Power Interface) is an industry standard that allows the OS to control hardware power consumption and configuration.

Interrupt Requests (IRQs) are signals sent by hardware to the CPU to indicate that the device needs CPU time to process an event.

Drivers must interface with the specific kernel of an OS; therefore, a driver for Windows will not function natively on Linux or macOS.

A corrupted BIOS prevents the computer from completing the POST process, effectively 'bricking' the motherboard until it is repaired or reflashed.

Direct Memory Access (DMA) allows peripherals to read from or write directly to main system memory without requiring constant CPU intervention.