Guided Access helps someone using iPad to stay focused on a task. Guided Access limits iPad to a single app, and lets you control which app features are available. Use Guided Access to:
Disable the iPad hardware buttons
Use Guided Access. Go to Settings > General > Accessibility > Guided Access, where you can:
Start a Guided Access session. Open the app you want to run, then triple-click the Home button. Adjust settings for the session, then click Start.
End a Guided Access session. Triple-click the Home button and enter the Guided Access passcode.