BIOS stands for Basic Input/output System. It is a non-volatile firmware used to start the PC when we switch it on. It also allows us to set up the PC at the most basic level. It is found on the motherboard as a software or firmware component, and includes instructions on how to load basic computer hardware. When we turn the PC on, the BIOS perform a test referred to as POST (powerself-test). The test checks whether the PC meets requirements to start properly. On failure, we receive beep sounds that indicate what is wrong within the computer. BIOS also act as a way for the manufacturer to correct small bugs and to add functionality in the future.
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