UEFI, or Unified Extensible Firmware Interface, is a modern firmware interface that connects a computer's operating system to its hardware. It replaces the older BIOS (Basic Input/Output System) and offers faster boot times, improved security features, and support for larger hard drives. UEFI can also provide a graphical user interface, making it easier for users to configure system settings. One of the key advantages of UEFI is its ability to support Secure Boot, a feature that helps protect the system from malware during the boot process. UEFI also allows for more flexible partitioning of storage devices, enabling better management of system resources and improved performance.