This document summarizes the PC booting process. It begins with definitions of common terms like BIOS, UEFI, MBR, and GPT. It then explains the role of the motherboard and external flash chip in booting. The document outlines the standard booting procedure, from the external flash/BIOS launching the partitioning table and secondary bootloader, which then loads the operating system kernel. It also compares UEFI vs legacy BIOS and MBR vs GPT boot methods. Finally, it briefly mentions the partition boot sector and Linux boot sequence.