UEFI started life as Intel's EFI specification. See Grub2#UEFI_vs_BIOS_boot for a comparison of BIOS and UEFI boot via GRUB, the default bootloader in Debian. It's a standard specification for the firmware interface on a computer, and it has been implemented by multiple vendors on various platforms. (U)EFI stands for (Unified) Extensible Firmware Interface.
Firmware does not support setting boot variables. Firmware has run out of space to write boot variables. grub-install unable to set up boot variables. Could not read EFI vars under RT kernel. How to reinstall the grub-efi bootloader on Debian. Support for mixed-mode systems: 64-bit system with 32-bit UEFI. Force grub-efi installation to the removable media path. Dual-booting systems currently installed using BIOS fallback boot. Quirks, workarounds and special UEFI features in Debian and Debian-Installer. efibootmgr example 3 - add a new boot entry. efibootmgr example 2 - verbose display of boot entries. 
efibootmgr example 1 - display boot entries.ARM32 platform: UEFI, U-Boot, Fastboot, etc.ARM64 platform: UEFI, U-Boot, Fastboot, etc.
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