A BIOS (Basic Input/Output System) is an electronic set of
instructions that a computer uses to successfully start operating. The
BIOS is located on a chip inside of the computer and is designed in a
way that protects it from disk failure.
A main function of the
BIOS is to give instructions for the power-on self test (POST). This
self test ensures that the computer has all of the necessary parts and
functionality needed to successfully start itself, such as use of
memory, a keyboard and other parts. If errors are detected during the
test, the BIOS instructs the computer to give a code that reveals the
problem. Error codes are typically a series of beeps heard shortly after
startup.
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