What is Computer BIOS? Explained in detail 2021

Today we will talk about what is Computer BIOS? And what is its function? Along with this, you will also come to know what is CMOS? If you do not know about this Computer Technology, then you are in the right place. Here You will get information about Computer BIOS and many important functions of Computer, which will be very helpful for you as a computer operator and you can do much important work with it.

What is Computer BIOS? Explained in detail
What is Computer BIOS

If you are a computer user, then you should know what the BIOS is and what is the work of the BIOS in the computer. Before procedding it is very important to know the full form of Computer BIOS, Let me tell you the the full form of BIOS. the dull form of BIOS is Basic Input Output System.

What is Computer BIOS?

The BIOS i.e. Basic Input Output System is the most important part of a computer. Its main function is to start up Computer Boot Process i.e. to Start Computer Start.

With this, it configures all the Input/output devices such as Mouse, Keyboard, Scanner, Printer, etc., and identifies the computer which is the Input Device and which is the Output Device. The EEPROM (Electrically Erasable Programmable ROM) on the BIOS Software Motherboard is stored on the ROM chip.

What is CMOS?

The CMOS i.e. Complementary Metal Oxide Semiconductor is a battery, which stores all the settings in the BIOS, and with the help of this, the BIOS starts the Computer Booting Process.

You must have seen that even after computer OFF, its time & date does not change. This is because the setting of Time & Date is stored in the BIOS and it runs with CMOS Battery. If the CMOS battery of a computer is bad, then after plugging in, it takes a little time to start the computer and the time & date are also reset.

What does the BIOS work for?

As I mentioned above, the BIOS helps in starting the computer and it configures all the Input / output devices. But with this the BIOS does many more important tasks that help the computer to run well. for example..

  • Checking Computer Setting and CMOS Setting.
  • Loading all Computer Drivers.
  • Doing power-on-self-test.
  • BIOS Password Set / Reset.

Can BIOS Setting be viewed?

Many people have a question in their mind that how to open BIOS settings. If you also have a question in your mind that “Can BIOS Setting be seen?” So the answer is, yes, you can access BIOS Setting.

For this, you just have to restart the computer and you will have to press this key before getting computer boot.

  • Press F2 for Dell PC.
  • F10 (after 2006) & F1 (before 2006) for HP PC
  • Press F2 for Acer.
  • Press F1 & F2 for Lenovo
  • Press F2 for Samsung PC.
  • For Sony PC press F1, F2 or F3.

And in many computers, you can also open Computer BIOS Setup through ESC Key. Just one thing you have to keep in mind is to press this key before the Windows logo arrives, only then the BIOS Setup will open.

How to update BIOS?

Many times it happens that the PC does not boot or all its Input/output device does not work correctly. Sometimes this happens because the BIOS is not up-to-date.

In such a situation, you can find out from the Internet which is the latest BIOS version and which version BIOS is installed in your PC. If you do not know how to check the BIOS version on a PC, then you should use these tips. You can go to BIOS Setting and check its version.

Press Windows Logo + R Key on the computer and enter as type MSinfo32 in the RUN command. System Information Setting will be open You can check BIOS Version from there also.

Computer Information

For information about BIOS Update, you should open the official website of your Computer Brand. From there you will get information about its updation.


So, Guys, HereI have told you what is Computer BIOS? And what is its function? With this, I have also told you about the CMOS battery and BIOS update. If someone asks you about the BIOS, you can answer it in one word that it works to start the Computer Booting Process and configure all Input / Output Devices. Hope you all have liked these tips.

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