Simple definition
UEFI is the modern firmware environment used to initialize hardware and initiate the system.
Technical definition
UEFI is the modern firmware environment used to initialize hardware and initiate the system. In the business environment, its configuration must be consistent with the network architecture, the safety policies and capabilities of the equipment concerned.
What is it used for?
managing modern amorcing, TPM and Secure Boot.
Practical example
Windows starts from an EFI partition.
Common issues
- Inconsistent configuration
- Compatibility or version
- Incomplete dependency diagnosis
Key takeaway: Always adapt the diagnosis to the product version and the architecture actually deployed.
See also: Secure Boot.