Could you explain what is meant by 'handler' in programming?

In programming, a handler is a function or method responsible for processing a specific event or action. For example, in Flutter, a handler can respond to a button press, text change, or other user interactions.

Example of a button press handler in Flutter:

ElevatedButton(
  onPressed: () {
    print('Button pressed');
  },
  child: Text('Press me'),
)

Here, the function passed to onPressed is the event handler for the press event.