The bios is software.
The BIOS is the first piece of software that is loaded when a personal computer starts.
In fact, it is a set of programs solidified to a ROM chip on the computer motherboard, which saves the most important basic input and output programs of the computer, the self-check program after startup and the system self-start program, and it can read and write the specific information of the system Settings from the CMOS. Its main function is to provide the lowest level and most direct hardware Settings and controls for the computer. In addition, the BIOS provides some system parameters to the operating system. Changes in system hardware are hidden by the BIOS, and programs use BIOS functions instead of directly controlling the hardware. Modern operating systems ignore the abstraction layer provided by the BIOS and directly control hardware components.