Explain what the use of StatelessWidget means in Flutter interface development.

In Flutter, a StatelessWidget is a widget that does not store or change its state after creation. Its content depends solely on input parameters and does not change during the widget's lifetime.

Using a StatelessWidget means that the interface it builds is immutable, and if an update is needed, a new widget with new parameters must be created.

Example of a simple StatelessWidget:

class MyButton extends StatelessWidget {
  final String label;

  MyButton({required this.label});

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () {},
      child: Text(label),
    );
  }
}

Here, MyButton does not hold state but simply displays a button with text from the label parameter. To change the text, a new instance of MyButton with a different label is created.

Using StatelessWidget simplifies the code and improves performance, as Flutter can optimize the rendering of such widgets.