You can lock iPad by putting it to sleep when you’re not using it. When you lock iPad, nothing happens if you touch the screen, but music continues playing and you can use the volume button.
Lock iPad: Press the Sleep/Wake button.
Unlock iPad: Press the Home button or the Sleep/Wake button, then drag the slider.
Turn iPad off: Hold down the Sleep/Wake button for a few seconds until the red slider appears, then drag the onscreen slider.
Turn iPad on: Hold down the Sleep/Wake button until the Apple logo appears.
Volume button and Side Switch
Allows you to adjust the volume level or switch volume off.
Port for charging and / or docking your iPad.
The Home button lets you get back to the Home screen at any time. It also provides other convenient shortcuts.
Front and Back Cameras
Used for either taking photos, video footage and image capture for a variety of apps.
Used to plug in ear phones or external speakers.
You can find more in-depth information from Apple’s website.