Web frameworks are collections of modules and packages that provide a structured way to develop web applications. They significantly simplify the development process by providing ready-made tools and structures for common tasks such as URL management (routing), database interaction, user management, and rendering HTML pages.

It is a full-stack web framework. Its philosophy is "batteries-included," which means it provides almost everything you need "out-of-the-box": a powerful ORM (Object-Relational Mapper) for databases, a user authentication system, an admin panel, and much more. It is ideal for large, complex applications that require rapid development with proven solutions.

It is a microframework. This does not mean it lacks features, but that its core package is lightweight and provides only the absolute essentials (like routing and a template system). For anything else (e.g., ORM, form handling), the developer is free to choose from a plethora of extensions. It is ideal for smaller applications, APIs, or for developers who want full control over every part of their application.

# Example of a very simple Flask application (does not run here)
# from flask import Flask
#
# app = Flask(__name__)
#
# @app.route('/')
# def hello_world():
#     return 'Hello, World from Flask!'
#
# if __name__ == '__main__':
#     app.run(debug=True)

print("Flask and Django are web frameworks for developing dynamic websites.")