The interface between the operating system, all of the system hardware, and the firmware that comes with the hardware is known as UEFI (Unified Extensible Firmware Interface).
The operating system, all of the hardware in the system, and the firmware all communicate with each other through the UEFI (Unified Extensible Firmware Interface).
PC systems are increasingly supporting UEFI, which is taking the place of the conventional PC-BIOS. For instance, UEFI allows secure booting ("Secure Boot," firmware version 2.3.1c or better required), one of its most crucial features, and correctly supports 64-bit computers. Last but not least, UEFI will make a standard firmware available on all x86 platforms.
The following benefits of UEFI are also available:
Booting with a GUID Partition Table from big disks (above 2 TiB) (GPT).
Drivers and architecture independent of the CPU.
Network-capable pre-OS environment that is adaptable.
Using a PC-BIOS-like bootloader, the CSM (Compatibility Support Module) will support booting legacy operating systems.
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