Correction: Apple also announced that the new iPhone 6s would introduce a new input method called "3D Touch," which uses Apple's "taptic engine" to detect the pressure of a user's press.
The "3D Touch," uses new capacitive panel technology that measures the force on the panel by measuring the distance of the capacitive panel and layer under it. Apple's "taptic engine" is just their name for a linear actuator, which creates vibrations. The "taptic engine" is used to create feedback for the user based on the strength of force of their press.
Source - engineering degree.
Thanks for the write up Austin, and welcome to the team!
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