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Boot means in layman language Power On your machine but in background following are some activities which computer machine does to switch on your pc:
CPU pins are reset and registers are set to specific value.
CPU jump to address of BIOS (0xFFFF0).
BIOS run POST (Power-On Self Test) and other necessary checks.
BIOS jumps to MBR(Master Boot Record).
Primary Bootloader runs from MBR and jumps to Secondary Bootloader.
Secondary Bootloaders loads Operating System.
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