You can lock iPad when you’re not using it. When you lock iPad, nothing happens if you touch the screen, but you can still listen to music and use the volume buttons.
Lock iPad Press the Sleep/Wake button.
Unlock iPad Press the Home button or the Sleep/Wake button, then drag the slider.
Turn iPad on Press and hold the Sleep/Wake button until the Apple logo appears.
Turn iPad off Press and hold the Sleep/Wake button for a few seconds until the red slider appears, then drag the slider.
If you don’t touch the screen for a minute or two, iPad locks automatically. To change this, see Auto-Lock. If you want to require a passcode to unlock iPad, see Passcode Lock.