BIOS, which stands for Basic Input Output System, is software stored on a small memory chip on the motherboard. The BIOS is responsible for POST, making it the very first software that runs when a computer is turned on.
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What is BIOS? | Explained
The BIOS firmware is non-volatile, meaning its settings are saved and can be restored even after power is removed from the device.
The BIOS instructs the computer on how to perform basic functions such as booting and keyboard control.
BIOS is also used to identify and configure the hardware in a computer such as hard disk, floppy disk drive, optical drive, CPU, memory and related equipment.