External Storage
Every Android-compatible device supports a shared "external storage" that you can use to save files.
This can be a removable storage media (such as an SD card) or an internal (non-removable) storage.
storage. Files saved to the external storage are world-readable and can be modified by the user when they enable USB mass storage to transfer files on a computer.
All applications can read and write files placed on the external storage and the user can remove them.
