Stands for “Basic Input/Output System”, ROM BIOS, or Program BIOS are a processor found on all motherboards which contain setup and directions for how it works and your system must start. The CPU accesses the BIOS even before the operating system is loaded.

The BIOS then checks all your hardware relations and locates all your devices. The BIOS also is used after the computer has start up. It works as an intermediary between the CPU and the I/O (input/output) devices. Because of the BIOS, your programs and your operating system don’t have to know exact details (like hardware addresses) about the I/O devices attached to your PC.

On the other hand it includes in an erasable programmable read-only memory (EPROM) chip. When the computer is turn on by any user the CPU accesses the EPROM and gives control to the BIOS.

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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.