What is a platform channel in Flutter, and how does it let your Dart code actually communicate with genuine native Android or iOS code when a required specific capability is not already available through an existing plugin?

A platform channel provides a genuinely well defined messaging mechanism specifically letting your Dart code send a message directly over to the underlying native platform, whether that means genuine Kotlin or Java code on Android or genuine Swift or Objective-C code on iOS, and then properly receive back a corresponding result, and this particular mechanism becomes genuinely necessary whenever your app needs to access a specific native platform capability that simply is not already exposed by any existing available Flutter plugin, letting you bridge that particular gap yourself by writing a genuinely small amount of your own custom native code.

static const platform = MethodChannel('com.example.app/battery');
final batteryLevel = await platform.invokeMethod('getBatteryLevel');