What are stateful components?

If the behaviour of a component is dependent on the state of the component then it can be termed as stateful component. These Stateful components are always class components and have a state that gets initialized in the constructor.

class App extends Component {
 constructor(props) {
  super(props);
  this.state = { count: 0 };
 }

 render() {
    // omitted for brevity
  }
}