A Dynamic Island is an interactive, oval-shaped iOS feature that appears on the upper part of a user's display screen by the TrueDepth camera. The feature, available on iPhone Pro 14+, enables users to continue an activity in progress or view an alert without having that activity take up their entire screen, making it easier to multitask.
As the "dynamic" part of Dynamic Island suggests, this feature will automatically change size and shape to adapt to whatever's being displayed on the screen. Users can also click on a dynamic activity to expand it and see more, collapse the activity into a smaller Dynamic Island, or switch between two activities in progress.
For app developers, the Dynamic Activities feature provides another way to keep users engaged and create a seamless UX.