To power off an Apple Watch, you can follow these steps:
1. **Press and hold the Side Button**: The Side Button is the button below the Digital Crown on the right side of the Apple Watch.
2. **Wait for the Power Off Slider**: Continue holding down the Side Button until you see the Power Off slider appear on the screen.
3. **Swipe the Power Off Slider**: Once the Power Off slider appears, swipe it from left to right using your finger.
4. **Confirm the Power Off**: After swiping the Power Off slider, a confirmation message will appear asking if you want to turn off your Apple Watch. Tap on "Power Off" to confirm.
5. **Wait for the Apple Watch to Power Off**: Your Apple Watch will begin the shutdown process and will power off completely after a few moments.
Once the Apple Watch is powered off, the screen will go blank, and it will no longer be operational until you turn it back on again by pressing and holding the Side Button until the Apple logo appears.