Secure Boot is a security feature implemented in modern computer systems, primarily in those using the Unified Extensible Firmware Interface (UEFI) firmware.
Its main purpose is to ensure that only trusted and authenticated software is loaded during the boot process, protecting the system against unauthorized or malicious code that could compromise its integrity and security.
During boot, UEFI Secure Boot checks the signature of each piece of boot software, including UEFI firmware drivers (also known as option ROMs), Extensible Firmware Interface (EFI) applications, and the operating system drivers and binaries. If the signatures are valid or trusted by the Original Equipment Manufacturer (OEM), the machine boots and the firmware gives control to the operating system.