BIOS also know as BASIC INPUT/OUTPUT SYSTEM plays an important role in the boot up of the PC.In IBM PC compatabile and nowadays in computers of various major brands like DELL,HP, the Basic Input/Output System (BIOS), also known as the System BIOS, is a defac to standard for defining a firmware interface.
The term BIOS first appeared in the CP/M operating system, describing the part of CP/M loaded during boot time that interfaced directly with the hardware (CP/M machines usually had only a simple boot loader in their ROM). Most versions of DOS have a file called "IBMBIO.COM" or "IO.SYS" that is analogous to the CP/M BIOS. the IO.sys file is hidden in most of the systems as it is a system file and must not be edited!!
Nowadays the BIOS is present inside the static RAM of most of the PC's.
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