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# Flask Tutorial !(#) Flask is a lightweight web application framework written in Python. Flask is based on WSGI (Web Server Gateway Interface) and Jinja2 template engine, designed to help developers quickly and easily create web applications. Flask allows us to rapidly write websites, APIs, and backend services using Python. Flask is suitable for small projects, API interfaces, and microservices. * * * ## Who Should Read This Tutorial? This tutorial is suitable for developers with basic Python knowledge. * Beginners with Python basics who want to get started with web development * Developers looking to learn a lightweight framework for quickly building websites and APIs * Beginners transitioning from zero to backend programming through self-study * People needing to quickly develop small projects, APIs, or backend services * Those who want to start with Python web but don't want to learn heavy frameworks * * * ## Prerequisites for This Tutorial Before learning this tutorial, you should understand some basic web knowledge and [Python 3.x Basics Tutorial](#). * Python Basics: Variables, loops, conditions, functions, lists/dictionaries, module imports * Web Basics: HTTP protocol, GET/POST requests, URLs, ports * Frontend Basics: Basic HTML and CSS are sufficient * Database Basics: Understanding basic CRUD operations in SQLite/MySQL * * * ## First Flask Program The following Flask program outputs "Hello World" on the webpage: ## Example from flask import Flask