The primary function of the Computer Bios (Basic Input/Output System) is to identify and make sure that the major computer components such as the, CPU, Hard Drive and Optical Drives. This prepares the computer for major functions operated by software, such as the booting of an Operating System from a hard drive, cd/dvd, floppy or USB.
The Bios contains code needed to run the keyboard, screen, disk drives and other functions. It is typically stored on the ROM (Read Only Memory) Bios, which means that if the computer suffers a major catastrophe (such as a broken CPU, or dead hard drive) then the Bios information remains unharmed and the computer will still be able to function after these components are replaced.
Viewing the BIOS information is actually quite simple. Find out how to open the BIOS setup here.
The Bios is what makes the computer boot from the operating system, it makes it initiate the POST (Power On Self Test). The more recent computer bios’ are flash compatible. This means that they can be updated to a more recent version.
However I would advise you not to flash your bios, as it is very dangerous and may result in a dead computer. Unless you have plenty of experience in this area, flashing the bios is a dangerous task.
If you do flash your bios and it works out all smoothly then congrats to you, however if your bios does not flash and your computer goes down, there are ways of fixing it. The more recent computers come with a bios recovery tool, in which you will be able to reset the computer back to factory settings.