@muhammadFaizanKhan there are two type of storage
1st is internal storage, which can not be accessed by anyother app or user. this wont be visible to you also. This storage is the one that will get deleted automatically when u remove the app… best used for apps internal settings.
2nd is external storage, which will be accessible by other apps or the users… example downloaded documents/ images files etc. this the programmer has to decide and write code to remove on app uninstall…