Haptic feedback is a feature on supported iPhone models that provides a tactile response when you interact with different elements of your iPhone. It is a small vibration that you feel when you touch and hold the screen or perform some actions. Haptic feedback is similar to 3D Touch, but it doesnt rely on pressure. Instead, it kicks in when you long-press the screen, offering a small vibration as acknowledgement following the press. Haptic feedback can be found in all sorts of places, including medical equipment, video games, and more.

To turn haptic feedback off or on, go to Settings > Sounds & Haptics (on supported models) or Sounds (on other iPhone models) and turn System Haptics off or on. You can also customize the intensity of the haptic feedback by going to Settings > Accessibility > VoiceOver > Audio > Sounds & Haptics > Haptics.

Haptic feedback can make interacting with an iPhone more efficient and intuitive, and it can be especially beneficial for users who are hearing impaired.