BIOS, an acronym for Basic Input/Output System is the first program that executes on the start up of a computer. It is located on a chip inside the computer to protect it from the disc failure. When you turn on the computer, BIOS performs a basic hardware and functionality check known as Power On Self Test (POST) to ensure that it has all the necessary components and functionalities to start the computer. Then it loads the operating system in the RAM (Random Access Memory).
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