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

Restart doesn’t fully turn the computer off, it just triggers a routine that resets everything as if it was turned off. So parts of the computer are still technically “on” during the entirety of a Restart.