So here’s the scenario: you grab your phone and don’t see anything in the notification bar. But you pull the shade down, and there one is. It’s a mysterious little guy with no icon in the bar.
This, in a nutshell, is a silent notification—a notification that shows up with no audible or visual alert to let you know it’s there. Why? Because it’s not that important. It’s passive information; something that you can check on at any point. It isn’t necessarily time sensitive, nor does it require any interaction. It’s just there to let you know something you may want to know.