☛ Performs a POST (Power-On Self Test) for all the different Hardware Components in the System to make sure everything is working properly.

☛ Activating other BIOS Chips on different cards installed in the computer, for example, SCSI and Graphics Cards.

☛ Provides a set of low-level suiting that the Operating System uses to interface different Hardware devices. BIOS manages things in your computer like the Keyboard, Monitor, Serial and Parallel Ports especially when the computer is Booting up.

☛ Manage the settings for Hard-disk drives, System Clock etc.