Basic Input/Output System, the system firmware found especially in IBM PC compatible computers. Use this tag only for the firmware part; for ‘DOS BIOS’, use [dos] instead.

BIOS, an acronym for basic input/output system, is non-volatile firmware used to perform hardware initialization during the booting process and to provide runtime services for operating systems and programs.

The BIOS firmware generally comes pre-installed in computers, and it is the first software to run when powered on.