Live Photos capture 1.5 seconds of video before and after your shot, giving your photos an extra dimension of life as compared to a still. While you can trim and edit Live Photos and add effects like Loop, Bounce and Long Exposure and even convert them GIFs (with third-party apps), there hasn't been a way to convert them to regular videos, until now.
Tapping on the Share icon gives you a menu of options that vary depending on what app you are in. For example, if you are in Safari you will have options to bookmark a webpage, add it to your reading list, send it to a friend and more, while pulling up the share sheet in Photos will give you some different options like create a watch face or add to a slide show. iOS 13 has overhauled the Share menu (or Action menu), adding a list of options beneath the two familiar horizontal rows.
Deep Fusion uses computational photography to combine several image captures into one high-fidelity photo. The resulting photos feature a higher level of detail, less noise, and improved textures.