What is BIOS in computer?

BIOS stands for Basic Input Output System. The Bios is a software or firmware that enables you to begin the system. It performs the basic maintenance of the system by checking all the hardware connected to the system load the Operating system. You can modify the BIOS setting to improve the performance of the system or to troubleshoot the system when it malfunctions.
The BIOS running in memory consists of all the previous drivers that provide the interface of hardware to the OS. The BIOS is unique and preloaded programmed into memory chips (ROM) installed in the system.

CMOS chip

Motherboard BIOS Functions

The BIOS is a collection of programs integrated into one or more chips, depending on the design of your computer. This collection of programs I lode first even before the OS is loaded. The BIOS in most PCs have four major functions.
POST – test Computer’s processor, Memory, Chipset, Video, adapter, disk controller, disk drives, keyboard, and other components.
Setup – Enables you to configure the motherboard and chipset settings. The system configuration and setup program is generally a menu-driven program which is activated by pressing a special key during the POST
BIOS – Collection of actual drivers which act as a basic interface between the OS and your hardware when the system is booted and running.
Bootstrap Loader – Reads the hard disk drives boot sector to load OS. It is a program which presents in the computer ROM or EPROM that is automatically executed by the processor when the computer is turned on. It is the job of this program to load the OS from the Hard Drive into the computer’s main memory (Ram). Unless The boot process is successfully completed i.e. the OS is copied to the main memory, User cannot the computer. A successful transfer of OS into Ram or the boot process is indicated by displaying the DOS prompt such as A:> or C:> on the computer monitor or it will directly go to the windows or Linux screen if you have windows or Linux operating system installed in your system

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