The BIOS (Basic Input/Output System) or UEFI (Unified Extensible Firmware Interface) is something every computer has, though unless you're running an ancient computer, you'll have a UEFI installed rather than a BIOS.
What does BIOS and UEFI do?
Your PC's BIOS or UEFI represents the lowest level of software, the most fundamental and foundational code running on your machine, often known as firmware. It runs from the motherboard, ensures all the various components of your computer are talking to each other, and makes the necessary preparations for Windows to boot up.
BIOS is the older technology; computers sold today use UEFI instead. In simple terms, UEFI improves on the basics of BIOS, adding support for more modern security standards and internal components. However, both BIOS and UEFI are essentially doing the same job.
A UEFI screen on an Asus motherboard. Credit: AsusAs often happens with computing terms, BIOS and UEFI can sometimes be used interchangeably. If you see talk about a BIOS with a modern computer, it's almost certainly talking about the UEFI, reflecting that the latter has effectively replaced the former. There are some rather detailed technical differences, too, but most of us don't need to know about them.
Should you update your BIOS or UEFI?
That said, BIOS/UEFI updates can absolutely bring security and performance improvements with them. As Dell puts it, updates can enhance "performance, stability, and compatibility with new software and hardware." Meanwhile, HP recommends updates if you need to support new hardware or fix known bugs and issues.
System Information will tell you what your motherboard is. Credit: LifehackerI'd recommend keeping an eye open for updates from whichever company made your PC or manufactured the motherboard inside it (find and run System Information from the Start menu to identify your motherboard). If an urgent BIOS/UEFI upgrade is needed, or if an update will add some major new functionality, you should then hear about it.
How to update the BIOS or UEFI
If you've got a Dell PC, for example, you've got no fewer than seven different update options to pick from. The easiest options are to use Dell's SupportAssist utility or to look out for firmware patches in Windows Up In both cases you can take care of everything through Windows, without any extra software.
Dell PCs can be updated via the SupportAssist utility. Credit: DellAs for getting to the BIOS/UEFI itself, the process for this varies by PC too: Typically, when your PC boots up, it'll tell you the key you need to press to head to the BIOS/UEFI instead of Windows. From Windows itself, you can open Settings then choose System > Recovery and click Restart now next to Advanced startup. When your PC reboots, pick Troubleshoot > Advanced options > UEFI Firmware Settings.
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