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What is Flutter and why is it popular for mobile app development?

Flutter is an open-source UI software development toolkit created by Google. It is widely popular for building natively compiled applications for mobile, web, and desktop from a single codebase.

To understand its popularity, consider the following key features:

  1. Single Codebase: Write once, run anywhere. This reduces development time and effort.
  2. Hot Reload: Developers can see changes in real-time without restarting the application, improving workflow.
  3. Rich Widgets: Flutter offers a wide range of customizable widgets that adhere to Material Design and Cupertino styles.

For example, to create a simple Flutter application, use the following code snippet:

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('Hello Flutter!')), 
        body: Center(child: Text('Welcome to Flutter!')),
      ),
    );
  }
}