What is InkWell in Flutter?

class _MyHomePageState extends State<MyHomePage> {
  String inkwell='';
  }
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('InkWell Widget'),
        backgroundColor: Colors.green,
      ),
      // setting the background color
      backgroundColor: Colors.lightBlue[50],
      body: Center(
        child: Column(
          children: <Widget>[
            // using the inkwell widget here
            InkWell(
              // on Tap function used and call back function os defined here
              onTap: () {
                setState(() {
                  // state will be set when the inkwell area is tapped
                  inkwell='Inkwell Tapped';
                });
              },
              onLongPress: () {
                setState(() {
                  // state will be set ehrn inkwell area is long pressed
                  inkwell='InkWell Long Pressed';
                });
              },
              child: Container(
                // container displaying the text
                  color: Colors.green,
                  width: 120,
                  height: 70,
                  child: Center(
                      child: Text(
                        'Inkwell',
                      ))),
            ),
  
            Padding(
              // this is showing the updated state of inkwell variable
              child: Text(inkwell,textScaleFactor: 2,),
            )
          ],
        ),
      ),
    );
  }
}