Can you explain what is meant by the term 'widgets' in the context of user interface development?

In the context of user interface development, especially in Flutter, widgets are the basic building blocks of UI. A widget is a declarative description of part of the interface that defines how it should look and behave.

In Flutter, everything is a widget: buttons, text, images, containers, and even entire screens. Widgets can be:

• StatelessWidget — do not have state and display static UI.
• StatefulWidget — can change their state and update the UI.

Widgets can be nested inside each other to create complex interfaces from simple components.

Example of a simple widget in Flutter:

import 'package:flutter/material.dart';

class MyButton extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: () {
        print('Button pressed');
      },
      child: Text('Press me'),
    );
  }
}

Thus, widgets are declarative UI descriptions that Flutter uses to build and update the interface.