Notification Center is where all notifications from iPhone apps are stored.
Notification Area It can be opened by simply sliding up up down the topcoated the display.
To delete all notifications received by Push Notification in Notification CenterWe have two choices. Either delete it by briefly the sign "X", and will remove only the day we chose to remove or long press even harder on the "X" until you see the option "Clear All Notifications"
“Clear All Notifications"It is a dedicated menu option that belongs Touch 3DTherefore is present only in iPhoneURLs that have this technology. iPhone 6S si iPhone 7, until the present.
Once you click this option will completely delete all messages from Notification Center. This is useful if you have a large volume of notifications and do not want to waste time deleting them each and every day.
I was not surprised to own the iPhone 6S and iPhone 7, which a few months after the utilities did not know 3D Touch :-)