What's is post in computer ?

In computer terminology, a post stands for Power-On Self Test. It is a diagnostic process that a computer's basic input/output system (BIOS) performs to ensure the hardware components are functioning properly before the operating system is loaded. The post checks various components such as the processor, memory, storage devices, and peripherals to detect any issues that may prevent the computer from booting up successfully. If any problems are detected during the post, error messages are displayed to alert the user to the issue.