What is the difference between Silent Push and regular Push notifications?

Silent Push is a type of push notification that is not directly displayed to the user (no sound, banner, or badge), but allows the app to perform certain actions in the background, such as updating data.

Regular push notifications are meant to inform the user and are displayed on the screen with visual and sound signals.

Example of using Silent Push in iOS:

// In the push payload, specify the key "content-available": 1
{
  "aps": {
    "content-available": 1
  },
  "customData": "update data"
}

This allows the app to wake up in the background and perform updates without user intervention.