
The Basic Input Output System (BIOS) is essential low-level software on one of the motherboard chips. It's responsible for basic operations, such as booting and configuring hardware (mouse, keyboard, memory, processor, and other components).
On the other hand, the Unified Extensible Firmware Interface (UEFI) is modern software designed to replace the legacy BIOS and provide additional benefits, such as improved security, faster boot times, large-capacity hard drive support, and more.