Explain what the 'Never' operator means in the context of reactive programming or asynchronous data streams.

In reactive programming, the Never operator represents a stream that never emits values and never completes. It does not send data events, errors, or a completion signal.

This is useful when you need to create a stream that remains active indefinitely or is used as a placeholder that does not affect other operators.

Example in Dart using RxDart:

import 'package:rxdart/rxdart.dart';

void main() {
  final neverStream = Stream.never();

  neverStream.listen(
    (data) => print('Data: $data'),
    onDone: () => print('Done'),
  );

  // None of the handlers will be called, as the stream never emits events.
}