Can you explain the concept of asynchronous programming and how it differs from the synchronous approach?

Asynchronous programming allows performing operations that take time (for example, loading data from the network) without blocking the main thread of the program. This means that the application can continue to operate and respond to user actions while a long-running task is being executed.

In a synchronous approach, code execution occurs sequentially: the program waits for one operation to complete before moving on to the next, which can lead to interface freezes.

In Flutter, the keywords async and await are used for asynchronous programming:

Future<String> fetchData() async {
  // simulate delay
  await Future.delayed(Duration(seconds: 2));
  return 'Data loaded';
}

void main() async {
  print('Starting download');
  String data = await fetchData();
  print(data);
}

Here, fetchData executes asynchronously, without blocking the main thread.