IBM introduced the first PC in 1981 when BIOS was a key part of the PC. The BIOS stands for BasicInput / Output System, a short piece of code embedded in the PC motherboard that handles basic hardware initialization and startup tasks. PC, the first is the BIOS detection hardware, after checking it will load the operating system, run the system and then provide some basic system services, such as receiving keyboard input commands, read / write content on the screen, hard drive.
In order to completely eliminate the BIOS by 2020, when Intel introduced the Sandy Bridge processor in 2011, PC hardware began to migrate to UEFI, and today UEFI is ubiquitous and basically all X86 system chips support UEFI, not the BIOS.
It is worth mentioning that the future of the X86 processor will clear some of the old technology, it may introduce pure 32-bit, 64-bit processor, is no longer compatible with 16-bit technology, so you can completely clean BIOS from UEFI out.