Could someone explain to me what I just wrote?

public static void saveAssetImage(Context context, String assetName) {
     // get the internal storage folder
     File fileDirectory = context.getFilesDir();

     // get file in the internal storage folder with name = assetName 
     File fileToWrite = new File(fileDirectory, assetName);

     // get assets manager to access assets files 
     AssetManager assetManager = context.getAssets();
     try {
          // open input stream to read from the assets file
          InputStream in = assetManager.open(assetName);

          // open output stream to write to the internal storage file
          FileOutputStream out = new FileOutputStream(fileToWrite);

          // missing copy function from inputStream to outputStream
          /* copyFile(inputStream, outputStream); */

          // close the streams after finish copying
          in.close();
          out.close();
     } catch (IOException e) {
          e.printStackTrace();
     }
}