The iPad’s main trick is that it disappears when you launch an app. Fire up a piano app, and your iPad becomes a piano. Launch YouTube and it turns into a TV for pacifying children. This is part of the magic of the iPad, but it’s not quite perfect. Kids can easily leave YouTube and start reading your sexts instead. And a musician might accidentally trigger a gesture while playing on those virtual piano keys, finding themselves back at the home screen in the middle of a performance.
What you need is kiosk mode, aka Guided Access. This locks the iPad into a single app, and disables the hardware buttons. And it’s equally good for keeping you in one app, or keeping people out of all the others.