While the purpose of smartphones is to let us receive verbal and written communications from others, there are certain times when you don't necessarily want your phone to beep, ring or otherwise make a noise or show a notification. Do Not Disturb is a handy setting that lets you choose when you want receive calls or notifications.
In this short video, which can be set to full-screen for looking at details, you'll see how to enable Do Not Disturb and how to use the app's settings.