Definition – What does BIOS mean?
Basic Input/Output System (BIOS) is a pre-installed program on Windows-based computers that the computer uses to start up. The central processing unit accesses the BIOS even before the operating system (OS) is loaded. It checks all your hardware connections and finds all your devices quickly. If everything is fine and connect correctly, the BIOS loads the operating system into the computer’s memory and finishes the boot process, if any device in your computer is damaged or not play properly, it a show a message.
Glossary Web explains BIOS
The BIOS also is used after the PC has booted up and acted as an intermediary between the CPU and the input/output devices. Because of the BIOS, your programs and operating system do not have to know exact details about the input/output devices that are attached to your PC. When a device or device details change, only the BIOS needs to be updated. You can easily make these changes by entering the BIOS when your system starts up.
BIOS is placed in the nonvolatile ROM chip inside the computer that ensures the availability of BIOS at all time and preventing accidental disk failure. The BIOS software is designed to work with the several devices that make up a complementary system chipset. Its library has certain functions that are used to operate and control system peripherals that can be initiated by external software.