Apple's new iPhone 11 and iPhone 11 Pro quietly ditched a feature that was first introduced 4 years ago

The newly-unveiled iPhone 11 and iPhone 11 Pro do not include the 3D Touch feature found in past Apple products.

3D Touch was first introduced for the iPhone 6S in 2015 and has been a feature of every iPhone up until the iPhone XR.

3D Touch has officially been phased out of the new lineup and replaced with “Haptic Touch,” a less complex feature.

When it unveiled the new iPhone 11 and iPhone 11 Pro at its huge expo event Tuesday, Apple drew attention to their new camera hardware and software, longer battery life, and faster bionic processor.

One subtle change wasn't highlighted at Apple's expo, but appears to be going into effect: Apple is discontinuing 3D Touch, which had been an iPhone feature since 2015.

The iPhone 11 and iPhone 11 Pro will ditch 3D Touch in favor of “Haptic Touch,” according to Apple's website.

3D Touch allowed for different levels of responsiveness based on how hard users pressed down on their iPhone screen — for instance, pressing hard on an app icon would open a dropdown menu, while gently tapping the app would open it. The new iPhones' Haptic Touch will be responsive to how long users hold down, but not the force of the tap.

Here's a look at the life and death of 3D Touch, and how it stacks up to Haptic Touch on the iPhone 11 and iPhone 11 Pro.