BIOS Basic Input Output System

BIOS, in computing, stands for basic input/output system. BIOS refers to the software code run by a computer when first powered on. The primary function of BIOS is to prepare the machine so other software programs stored on various media (such as hard drives, floppies, and CDs) can load, execute, and assume control of the computer.

Full definition of BIOS at Wikipedia

The BIOS runs on a small chip on the motherboard and contains just enough code to make it self-aware and to boot to an operating system. This code is Firmware and can be updated through the manufacturer. Sometimes it is necessary to enter the BIOS to correct configuration issues. This is often done by hitting either ESC, F1, F2, F10 or the Delete key when first powering up the computer. Some BIOSes will also e=issue a beep code when encountering a problem during POST. This beep code is an important tool in computer troubleshooting. If you're not sure who manufactures your system's BIOS, look inside of the case for a major name such as: AMI BIOS, Phoenix, AMerican Megatrends, etc.

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