A dynamic wallpaper animates when you interact with it.
How to download and set up
You need to be on an iPhone 6 or newer a iPhone to download and use this format of wallpapers.
When you tab the download button your device will automatically switch to the “Photos” app and show you these dynamic wallpapers, to save them on your device tab “add to library”.
Make sure this switch is one when you set up a dynamic wallpaper.