eli5: How does “restart” work? when a device, e.g. windows PC is turned off, how does in know to turn itself back on?

Question

Edit: Typo in title🤦‍♀️

How does it* know to turn itself back on?

In: 114

Answer 1

Every PC has a BIOS, which basically handles a load of the super basic stuff. Think of it like the instructions that tell you how to open a box. From there the BIOS boots the OS by mounting the boot partition. Think of it like the opened box having a little delivery robot will then fetch all the necessary materials for your task.