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BIOS stands for Basic Input Output System.
System Bios is a chip located on all the mother board which which contains a set of instructions how your system should boot and operate.

There are four main types of which BIOS performs:
1) POST-- it test the computer hardware and confirms that there is no error in the hardware before the operating system is loaded
2)Bootstrap loader--Locates the operating system and if it is found gives all the control to the operating system
3)BIOS Driver- here the drivers give basic operational control to the hardware
4) BIOS setup--Configuration program that allows you to configure hardware settings including the system settings..
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Bios are the files which control processes like your computer clock and background processes when you see the windows when starting your computer its because of bios
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