Basic Input or Output System (BIOS) or Unified Extensible Firmware Interface (UEFI) is firmware that is embedded on the computer's system board or motherboard. Modern Dell computers are shipped with Unified Extensible Firmware Interface (UEFI). BIOS or UEFI acts as an interface between the computer's hardware and the operating system.
The BIOS or UEFI interface may vary on your Dell computer. To learn how to navigate the BIOS or UEFI, go to Dell.com/support/manuals, identify your Dell computer, and see the user guide.
Example of the BIOS or UEFI interface on an OptiPlex 7050.
Example of the BIOS or UEFI interface on a Precision 5550 mobile workstation.
Updating the BIOS or UEFI, also known as "flashing the BIOS", replaces the BIOS or UEFI firmware with the latest version. When updated successfully, a BIOS or UEFI update can fix or enhance the computer's performance or support for newly installed hardware.
Dell provides an easy-to-use executable (.exe) file to update the BIOS or UEFI to the latest version. To learn more, see Dell BIOS Updates for step-by-step instructions to download and install the latest BIOS or UEFI or watch this video to update the BIOS or UEFI.