what is placemark in flutter geocoding

I m very beginner for flutter google maps. I just want to know what is placemark in flutter geocoding and I just need to understand the below code. Thank you so much for any help.

  _getAddress() async {
try {
  List<Placemark> p = await placemarkFromCoordinates(
      _currentPosition.latitude, _currentPosition.longitude);
  Placemark place = p[0];

  setState(() {
    _currentAddress =
        "${place.name}, ${place.locality}, ${place.postalCode}, ${place.country}";
    startAddressController.text = _currentAddress;
    _startAddress = _currentAddress;
  });
} catch (e) {
  print(e);
}

}

Placemark is a class that contains information like place's name, locality, postalCode, country and other properties. See Properties in the documentation.

placemarkFromCoordinates is a method that returns a list of Placemark instances found for the supplied coordinates.

Placemark place = p[0] just gets the first Placemark from the list you got from placemarkFromCoordinates method.

The code inside the setState method just updates the _currentAddress to the place info you got from the Placemark place and then passes its value to the startAddressController.text and _startAddress.