title: Please explain like I'm 5: What is the purpose of MainAxisSize in Flutter?
body: <p>I'm quite seeing the effect of MainAxisSize but I don't understand its purpose. Please explain like I'm 5. Thank you.</p>
  <p>For further reference:</p>
  <pre><code>class MyApp extends StatelessWidget {
    @override
    Widget build(BuildContext context) {
      return MaterialApp(
        home: Scaffold(
          backgroundColor: Color(0xffEDE7F6),
          body: SafeArea(
            child: Column(mainAxisSize: MainAxisSize.min, children: &lt;Widget&gt;[
              Container(
                height: 100,
                width: 100,
                color: Color(0xff9575CD),
                child: Text('Container 1'),
              ),
              Container(
                height: 100,
                width: 100,
                color: Colors.black45,
                child: Text('Container 2'),
              ),
              Container(
                height: 100,
                width: 100,
                color: Colors.black12,
                child: Text('Container 3'),
              ),
            ]),
          ),
        ),
      );
    }
  }
  </code></pre>
  <p>Output on emulator:</p>
  <p><a href="https://i.stack.imgur.com/tTFJF.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/tTFJF.png" alt="enter image description here" /></a></p>