UEFI is the Unified Extensible Firmware Interface.
It is a specification for a software program to connect a computer's firmware to its operating system. Its origins came from Intel's Itanium days (64 bit microprocessor family launched in 2001, originally known as IA-64, with clock speeds ranging from 733MHz to 2.66GHz), where BIOS was found to be too restrictive for the larger server platforms being targeted by Itanium. It was then called Intel Boot Initiative and later EFI or Extensible Firmware Interface.
The first open source implementation of UEFI was released by Intel in 2004 and named Tiano. In December 2018, Microsoft forked Tiano and created Project Mu.
UEFI is expected to eventually replace BIOS.
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