• Describe the components of a web application framework.
• Build and run a Flask application on your computer.
• Manipulate and test the structure of a request object.
• Extend a Flask application to meet the unique requirements of different projects.

• Web Framework: software that is designed to support the development of web applications. Web frameworks provide built-in tools for generating web servers, turning Python objects into HTML, and more.
• Extension: a package or module that adds functionality to a Flask application that it does not have by default.
• Request: an attempt by one machine to contact another over the internet.
• Client: an application or machine that accesses services being provided by a server through the internet.
• Web Server: a combination of software and hardware that uses Hypertext Transfer Protocol (HTTP) and other protocols to respond to requests made over the internet.
• Web Server Gateway Interface (WSGI): an interface between web servers and applications.
• Template Engine: software that takes in strings with tokenized values, replacing the tokens with their values as output in a web browser.

Flask gives us the ability to take all of the Python and SQL code we built in Phase 3 and serve it to users on the internet. In this module, we learned a number of skills that will help us make flexible and powerful websites later on:

• Configuring WSGIs and web servers.
• Routing to views at fixed and parameterized URLs.
• Using application and request context to deliver information from the internet to our views.
• Creating databases and integrating them with Flask applications with Flask-SQLAlchemy and Flask-Migrate.
• Combining these skills to pass information between our database, our application, and the internet.

Next, you'll learn about APIs: a tool for accessing information on the internet efficiently and in an organized way.

• Flask Documentation
• Armin Ronacher
• Werkzeug Documentation
• Jinja Documentation
• Click Documentation
• The Pallets Projects