Flutter is a offered by Google that let developers build cross-platform applications that could be executed in different systems such as Android or iOS with just a common codebase.

Flutter uses Dart as a single programming Language.

Flutter does not execute Dart code directly, but compiles the code to native for better performance.

main() calls the runApp function which requires you pass a Widget object as a parameter.

import 'package:flutter/material.dart';

void main() {
  runApp(
    Center(
      child: Text(
        'Hello, world!',
        textDirection: TextDirection.ltr,
      ),
    ),
  );
}

If you want to use the Material design system Flutter has a convienient MaterialApp class that a number of widgets that are commonly required for material design applications

import 'package:flutter/material.dart';

void main() {
  runApp(
    MaterialApp(
      home: Text("Hello, World!")
    )
  );
}

We can use the MaterialApp class to create and pass a Widget object and