What are processes run by the BIOS at boot-up?

During boot-up, the BiOS (Basic Input/Output System) performs several key processes. It conducts a Power-On Self-Test (POST) to check hardware components like RAM, keyboard, and drives for errors. After confirming that hardware is functioning correctly, the BiOS locates and initializes the boot device, typically a hard drive or SSD, and loads the operating system's bootloader into memory to start the OS. Additionally, it may configure system settings based on user-defined parameters in the BiOS setup.