BIOS
UEFI
UEFI
Pretending to be BIOS
MBR
GPT
https://www.happyassassin.net/2014/01/25/uefi-boot-how-does-that-actually-work-then/
MBR
GPT
Computer Built Before 2005
Computer Built After 2015
The Partition format has a symbiotic relationship with the firmware which I will explain in a bit, that is why both are being shown here