Explain what is the common way for the Flask script to work?

A standard Flask application operates as a WSGI (Web Server Gateway Interface) micro-framework that maps incoming HTTP URLs to Python view functions:

### Standard Architectural Flow:

1. Application Instance: Instantiate Flask(__name__) to initialize static asset paths and template directories.
2. Route Decorators: Use @app.route('/path', methods=['GET', 'POST']) to register URL endpoints in the Werkzeug URL map.
3. Request Lifecycle: When a client sends an HTTP request, Flask pushes a request context (request global proxy) containing headers, cookies, query parameters, and JSON payloads.
4. View Function Execution: The matching function processes business logic, interacts with a database, and returns a response string, JSON via jsonify(), or rendered Jinja2 template via render_template().
5. WSGI Server Deployment: In production, Flask is served by production WSGI servers like Gunicorn or uWSGI sitting behind an Nginx reverse proxy:

   gunicorn -w 4 -b 0.0.0.0:8000 app:app