What is the purpose of the POST process during startup?

The Power-On Self-Test (POST) process is a critical step that occurs when a computer is powered on. Its primary purpose is to run a series of diagnostic tests on the hardware components of the system to ensure they are functioning properly before the operating system is loaded. During POST, the computer checks essential hardware such as the CPU, RAM, hard drive, and motherboard to identify any faults or failures that could prevent the system from operating correctly. If any issues are detected, the POST process can alert the user through error codes or beeping sounds, indicating what needs to be addressed. Successful completion of POST is crucial for the system to proceed to the next stage of the boot process, which involves loading the operating system.