Apple introduced the Taptic Engine with the iPhone 6s, where it replaced the old vibration motor and was also used to provide haptic feedback for when you activated 3D Touch. This year with the iPhone 7, Apple has improved the Taptic Engine and it plays a critical role in simulating the press of the Home button, which is no longer a physical button. But the Taptic Engine in the iPhone 7 goes even further with the introduction of System Haptics, where a number of UI elements in iOS will now also provide tactile haptic feedback when you activate them.
I have had my iPhone 7 for nearly a week now, and these new System Haptics have been a great delight to discover, and use. These System Haptics are mostly subtle and feel very natural, so you may not have even noticed them. Below I’ve compiled a list of all the places in iOS that I’ve noticed them appear.