Rather than trying to explain with more tech terms, I believe that this will make it easier to understand… Then, when the computer starts up, the BOOTMGR hands over control to the Operating System, for example, Windows 11. With all this in mind, I’ll now define the Windows Boot Manager (BOOTMGR) as Microsoft’s UEFI application that interacts with your computer when it is starting up. Then, on a different layer, the OS interacts with the firmware in the process. So, as you send and receive information to and from your computer, the OS interacts with you. The firmware then works with the Operating System (OS) to interact with the various hardware components on your computer. Without confusing our non-tech readers further, firmware is software that manages the various hardware in a computer. Now, it is getting all confusing since I just used another tech term, “ROM,” but I will now stop explaining. Ok, I just used the word “firmware” while explaining “UEFI application.” A firmware is a computer program that is written into the computer’s ROM (Read-only Memory). If you’re wondering what a UEFI application is, in its basic form, it is an application that connects a computer’s firmware to its Operating System. The Windows Boot Manager is a UEFI (Unified Extensible Firmware Interface) application provided by Microsoft.
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