What Flask Is and How Web Apps Work

In this lesson, students learn what Flask is, where it fits in Python web development, and how a basic web application responds to browser requests. The focus is conceptual and practical: routes, request-response flow, URLs, view functions, and the role of Flask as a lightweight web framework.

By the end, students should understand the moving parts of a simple Flask app before writing code in later lessons. This foundation prepares them to create their first route, return a response, and gradually build toward templates, forms, data handling, and deployment readiness.