In Flutter, the InkWell widget is used to create a material touch ripple effect for its child widget. It's often used to make a portion of your UI respond to touch gestures, such as tapping. The InkWell widget wraps around another widget and provides a visual response to user interactions.

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('InkWell Example'),
        ),
        body: Center(
          child: InkWell(
            onTap: () {
              // Handle tap event
              print('InkWell tapped!');
            },
            child: Container(
              padding: EdgeInsets.all(16.0),
              child: Text('Tap me'),
            ),
          ),
        ),
      ),
    );
  }
}