Where does application data file actually stored on android device?

On Android 4.4 KitKat, I found mine in: /sdcard/Android/data/<app.package.name>

Application Private Data files are stored within <internal_storage>/data/data/<package>

Files being stored in the internal storage can be accessed with openFileOutput() and openFileInput()

When those files are created as MODE_PRIVATE it is not possible to see/access them within another application such as a FileManager.