Smart Shoot is a Windows Phone 8 photography app, exclusive to the Nokia Lumia phones such as the Lumia 920. Smart Shoot is a stand alone app much like the smart group shot feature in Nokia's Camera Extras for Windows Phone 7.5 and is designed to help you take better people or group pictures by correcting those distracting facial expressions.
Ever take a picture of your friends and someone has their eyes closed or they are looking away? If you catch it, you can always re-shoot the picture but then everyone gets impatient and they threaten to revolt. If you miss it, then you're stuck with a bad photo. Smart Shoot is designed to avoid these type situations.