In the [official Apple support guide to reset the SMC of a Mac with the T2 chip](https://support.apple.com/en-gb/HT201295), it says:

> 
> Before resetting the SMC, try these steps:
> 
> 
> 1. Shut down your Mac.
> 2. Press and hold the power button for 10 seconds, then release the button.
> 3. Wait a few seconds, then press the power button to turn on your Mac.
> 
> 
> 

[![Reset the SMC on computers that have the T2 chip](https://i.stack.imgur.com/376AJ.png)](https://i.stack.imgur.com/376AJ.png)

What does step 2 do?