Peek and Pop are two functions available on iPhones that allow you to preview web pages, messages, and more without interrupting what you’re doing, providing the chance to decide whether to commit to opening them fully. For example, if somebody sends you a web link or address in Messages, you can get a sneak peak of the content without leaving the app for Safari or Maps.
To activate Haptic Touch, long-press on a link or item in a list to peek at the contents. This will bring up an overlay showing a preview of the content. Tapping on the overlay then pops it into the foreground. You can also swipe up from the preview for additional options like Reply and Notify Me. Some apps allow you to swipe left or right for other quick actions, such as trashing an email from Mail.