Welcome to Flask’s documentation. This documentation is divided into different parts. I recommend that you get started with Installation and then head over to the Quickstart. Besides the quickstart, there is also a more detailed Tutorial that shows how to create a complete (albeit small) application with Flask. If you’d rather dive into the internals of Flask, check out the API documentation. Common patterns are described in the Patterns for Flask section.
Flask depends on two external libraries: the Jinja2 template engine and the Werkzeug WSGI toolkit.