Explain StatefulWidget vs StatelessWidget in Flutter.

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In Flutter, StatefulWidget and StatelessWidget are two core types of widgets used to build the user interface. The key difference between them lies in how they manage state, which is data that can change over time (like user input, animations, or network responses).

🔹 StatelessWidget

A StatelessWidget is immutable, meaning its properties can’t change—all values are final. It is ideal for UI components that don’t need to update after they are built.

✅ Use when:

The widget does not need to update (re-render) after being created.

All the data needed is passed from the parent and does not change.

Example:

dart

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class MyStatelessWidget extends StatelessWidget {

  final String title;

  MyStatelessWidget({required this.title});

  @override

  Widget build(BuildContext context) {

    return Text(title);

  }

}

🔹 StatefulWidget

A StatefulWidget is mutable—it can change its state during the lifetime of the widget. It creates a separate State object that holds mutable state and can call setState() to trigger a UI rebuild.

✅ Use when:

You need to update the UI based on user interaction or internal logic.

You’re handling animations, form fields, timers, etc.

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