3D Touch Notifications allows to preview the content of notifications (Calendar, Mail, Messages, FaceTime, Phone and even Recents 2) on Notification Center without launching the app. And also it provides relavant preview actions for those notifications, where you can interact with the sender of the notification. If you want to open the associated app with the notification, just press litte harder (available iPhone 6s or above) on the notification will do the trick.
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