This tutorial guides users in building an SMS chatbot using the ChatGPT API, Twilio Programmable SMS, and Python. It begins by introducing the user to ChatGPT, a highly advanced language model trained on large amounts of text, and its capabilities. The tutorial then provides step-by-step instructions for creating a virtual environment, installing necessary packages, configuring an OpenAI API key, and sending ChatGPT requests from Python. Additionally, it covers setting up Twilio Programmable SMS messaging, configuring a webhook URL, and integrating the two to create a complete chatbot project. The final application uses Flask to send messages received from users to the `askgpt()` function created earlier, maintaining the log of the chat in the session variable from Flask.