BIOS stands for Basic Input/Output System
BIOS is a piece of firmware stored on a small memory chip on the motherboard
On system start, the BIOS is the first software to run
It performs a POST (Power-On Self-Test), a diagnostic testing sequence that ensures all the hardware components are working properly
If the BIOS encounters any errors during this test, it will either halt the boot process or issue an error message
If the POST succeeds, the BIOS will run the Bootstrap loading sequence, which is the program responsible for starting the operating system
