App slicing! I repeat… APP SLICING!! Finally Apple has come up with a way to clear up space on your devices without resorting to an external drive. The process includes will include creating and delivering different variants of the app bundle. Certain parts of the apps are “sliced” according to their configurations in order to free up storage space in the device while the application itself remains the same.
In order to use this feature you must have iOS 9.0.2 or higher. Check it out more about this in the article below: