This AI chatbot uses OpenAI's GPT-3.5 model to provide human-like responses to user inquiries on WhatsApp, utilizing the Twilio Messaging API and a PostgreSQL database to store conversations. The chatbot is built using FastAPI and Pyngrok, allowing it to be accessible over the internet through an ngrok tunnel. The code includes a utility script to handle sending messages through the Twilio API and a main application that handles incoming requests from WhatsApp users.