This tutorial demonstrates how to convert a Python REST API to GraphQL using Hasura Actions. It involves setting up a Hasura Cloud project and creating an Action with the necessary types and definitions. The process includes generating boilerplate code for a Flask server, defining business logic, and exposing the server on a public URL using ngrok. The tutorial also covers connecting to a database from inside the Flask server, managing permissions and relationships, handling existing REST API endpoints, and supported frameworks.