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What Is a BIOS and Why Your Computer Has One

The BIOS stands for Basic Input/Output System. Think of it as the instruction manual your computer reads before it even starts up Windows, Mac OS, or Linux. When you press the power button on your computer, the BIOS is the first program that runs. It checks all your hardware—your hard drive, memory, keyboard, and mouse—to make sure everything is connected and working properly. Only after the BIOS finishes this check does your operating system begin to load.

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Every computer manufactured in the last 30 years has had a BIOS, though newer systems now use something called UEFI (Unified Extensible Firmware Interface), which is basically an improved version of BIOS. Even though it's called UEFI, most people still refer to it as "BIOS" in everyday conversation. The BIOS sits on a small chip on your computer's motherboard and contains firmware—permanent software that controls basic hardware functions.

Your BIOS version matters for several practical reasons. Hardware manufacturers regularly release BIOS updates to fix bugs, improve stability, and add support for new processors or devices. If your computer is running an outdated BIOS version, you might experience slower performance, incompatibility with new hardware, or security vulnerabilities. Some software programs may not run correctly if your BIOS version is too old. Understanding what BIOS version your computer currently has is the first step toward knowing whether an update might benefit you.

The BIOS also controls important settings like boot order (which device your computer tries to start from first), fan speed, power settings, and security features. Most computer users never need to change these settings, but knowing your BIOS version helps you understand your computer's foundation and can be useful information to have when troubleshooting problems or seeking technical support from manufacturers.

Practical Takeaway: Your BIOS is the foundational software that starts your computer before anything else loads. Knowing your BIOS version tells you whether you might benefit from updates that could improve performance, stability, or hardware support.

How to Find Your BIOS Version on Windows Computers

Finding your BIOS version on a Windows computer is straightforward and takes about two minutes. There are several methods you can use, and each one is equally reliable. The easiest method for most people is using the System Information tool, which comes built into Windows and requires no additional software.

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To use System Information, first click the Windows Start button and type "System Information" into the search box. Click on the System Information application when it appears. A window will open showing details about your computer. Look for a field labeled "BIOS Version/Date" or similar. The information will appear in a format like "BIOS Date: 12/15/2021, BIOS Version: AMI 5.12" or something comparable. This tells you both when your BIOS was released and what version number it is. Write down this information for your records.

Another method uses the Command Prompt, which is useful if you prefer typing commands. Press the Windows key and type "cmd" to open Command Prompt. Type the command: wmic bios get smbiosbiosversion and press Enter. Your BIOS version will appear on the next line. This method shows the BIOS version in a slightly different format but contains the same information.

A third option is to restart your computer and watch the startup screen carefully. During the first few seconds after you press the power button, your computer displays BIOS information on the screen, including the version number. However, this information disappears quickly, so you may need to take a photograph or write it down fast. This method works on virtually all computers but requires timing.

If you own a laptop, you can also check the manufacturer's website. Dell, HP, Lenovo, and other brands maintain support pages where you can enter your computer's model number and see what BIOS version it currently has installed, what the latest version is, and whether you need an update.

Practical Takeaway: Use the built-in System Information tool on Windows to find your BIOS version in under two minutes. Write down the version number and date for future reference when comparing it to newer versions.

Finding Your BIOS Version on Mac and Linux Systems

Mac computers store BIOS information in a different location than Windows computers, but it's equally simple to find. On Mac systems, the BIOS equivalent is called the firmware. To find this information, click the Apple menu in the top-left corner and select "About This Mac." A window appears showing basic system information. Look for a field labeled "System Firmware" or "Boot ROM Version." For example, you might see "System Firmware: 12.3.2" or similar. This is your firmware version, which is the Mac equivalent of a BIOS version. If you see no firmware information listed in the main About window, click the "More Info" button to access System Report, where firmware details appear in the Hardware Overview section.

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Mac systems updated since 2006 use Intel processors and standard firmware, though Apple's newest computers with Apple Silicon chips use a different system. For Apple Silicon Macs (M1, M2, and later models), the same About This Mac menu shows "System Firmware" information, but these machines handle firmware differently than older Intel-based Macs. If you're unsure whether your Mac uses Intel or Apple Silicon, the About This Mac window clearly states this information at the top.

Linux computers work differently because Linux users typically have more control over system-level settings. On Linux systems, BIOS information is stored in files rather than accessed through a graphical menu. Open a terminal window and type the command: sudo dmidecode -t bios and press Enter. The system will ask for your password. After you enter it, detailed BIOS information appears, including the manufacturer, version, and release date. This method requires administrator access but provides comprehensive BIOS details. If that command doesn't work on your system, try: cat /sys/class/dmi/id/bios_version which shows just the version number.

For Linux systems, you might also check the file /etc/os-release to understand your Linux distribution version, which can matter when determining if BIOS updates are available. Different Linux distributions may interact with BIOS in slightly different ways, so knowing your Linux version alongside your BIOS version provides useful context.

Practical Takeaway: Mac users find firmware information in the About This Mac menu under System Firmware. Linux users use terminal commands to display BIOS details. Both methods take less than a minute and provide the information you need.

Understanding BIOS Version Numbers and What They Mean

BIOS version numbers follow different formats depending on the manufacturer, but learning to read them gives you useful information about your system. The most common format is a simple number like "5.12" or "12.3.2", where each section separated by a period represents a different level of update. The first number typically represents a major version release, while numbers after the period represent minor updates or patches. For example, if your BIOS version is 3.0, an update to 3.1 is a minor fix, while an update to 4.0 would be a major new version with potentially significant changes.

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The date attached to your BIOS version is equally important. A BIOS version from 2018 means it hasn't received updates in several years and might be missing improvements released since then. A BIOS from 2023 is much more recent. The newer your BIOS version, the more likely it includes patches for security issues discovered in older versions, support for newer processors, and fixes for known problems. If your BIOS is more than three years old, there's a reasonable chance that updates exist that could benefit your system.

Different manufacturers use different naming conventions. AMI (American Megatrends Inc.), which produces BIOS software used in many computers, formats versions like "5.12" or "AMI 5.12". Phoenix, another BIOS manufacturer, uses similar formats. Intel and other manufacturers may use slightly different numbering schemes. If your BIOS version includes the manufacturer name in the version string, it's helpful to note this because it tells you where to look for updates. Some manufacturers also include a letter or code after the version number, like "5.12A" or "3.0 Rev.B", which indicates specific revisions within a