What does uefi mean?

uefi refers to Unified Extensible Firmware Interface, which is a personal computer system specification that defines the software interface between the operating system and system firmware as an alternative to BIOS. uefi is responsible for power-on self-test, contacting the operating system, and providing an interface connecting the operating system and hardware.

The operating environment of this article: Windows 7 system, Dell G3 computer.

Unified Extensible Firmware Interface (UEFI) is a personal computer system specification that defines the software interface between the operating system and system firmware as an alternative to BIOS. The extensible firmware interface is responsible for power-on self-test (POST), contacting the operating system, and providing an interface between the operating system and the hardware.

UEFI was formerly the Intel Boot Initiative developed by Intel in 1998 and was later renamed Extensible Firmware Interface (EFI). Intel handed it over to the Unified Extensible Firmware Interface Forum (Unified EFI Forum) for promotion and development in 2005. To highlight this, EFI was also renamed UEFI (Unified EFI). The founders of the UEFI Forum are 11 well-known computer companies, including hardware manufacturers such as Intel and IBM, software manufacturer Microsoft, and BIOS manufacturers AMI, Insyde and Phoenix.

It is generally believed that UEFI consists of the following parts:

• Pre-EFI initialization module

• EFI driver execution Environment

• EFI Driver

• Compatibility Support Module (CSM)

• EFI High-Level Application

• GUID disk partition table

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