BIOS

Have you ever wondered how your windows actually starts up? Or what is that, apparently, senseless writing that appears on your screen just after your turned on your PC?
That is the BIOS (basic input/output system).
It is similar to an operating system, it has support for keyboard input and is mostly responsible for easing the communication between the main OS and hardware components.

So what does it to.
First it checks your CPU, memory, hard disk and video card
if no errors are found, it proceeds to loading your operating system.

sounds easy?
well that isn't all there is to it.
BIOS is also responsible for the good working condition of your computer.
It manages your memory.
It manages the flow of power to specific hardware components.
It constantly checks the temperature of CPU, GPU, and power supply, and turns on or off the cooling fans.

As you can probably see by now, this guy is very useful.
In fact it is so important, that any kind of corruption or damage it suffers can render your computer worthless, just a bunch of metals and plastic.
So manipulating your BIOS is dangerous.
But don't worry! most mother boards nowdays have more than 1 BIOS.
The feature is called "dual BIOS". You virtually have 2 BIOS. One that is in use and one that stays as back up. for safety reasons, the user can not update, modify, delete or modify the back up BIOS in any way. Where as, you can delete, update and change settings your you main BIOS whenever you wish.

Keep in mind that the BIOS is a sensible thing. Should you need to change any setting, make sure your follow the on screen help, or the mother board manual. So, it is better to leave it the way it is if there are no problems caused by it.