Anna has designed an iOS app for a large shopping mall. She creates a location facility that includes a map of the actual mall. Shoppers can double tap on any part of the map to get a popover that lists the names of goods selling in that area. Which pattern of interaction design is Anna using?

A popover is a transient view that shows on a content screen when a user clicks on a control button or within a defined area. In the OS design system, a popover is preferred in big screens (tablet size or bigger). A popover subject to the general rules about modality, which renders a temporary context to get user’s attention.
According to OS design guidelines, one pitfall we need to avoid is the modal-over-modal interaction. In a popover container, only one single action is granted — complete, confirm or cancel. Additional hover or press behaviors on a popover should be withdrawn to prevent confusion. When an additional action is needed, a user has to dismiss the first popover and perform the action on the next popover.
In Material design, popovers are a part of dialogs. They are also used for single-action interactions like confirm, accept, delete or cancel. A notable difference between OS dialogs and Material dialogs is that OS dialogs save the work when a user dismisses a dialog but Material dialogs don’t. This results in distinctive results when a user drops out of a task flow.