This tutorial guides the reader through building an Interactive Voice Response (IVR) system using Go and Twilio. The IVR system, which provides weather information, allows users to interact with a computer system through voice and DTMF tones using a telephone keypad. The system offers various features such as automated call routing, interactive menus, data collection, integration with external systems, and multi-language support. To build the IVR system, one needs to have a Twilio account, Go 1.22 or higher installed on their machine, ngrok installed on their computer, and a phone number to make voice calls to the application for testing purposes. The tutorial covers setting up the core of the project, building HTTP handlers for TwiML response generation, creating TwiML response structs, adding utility functions for weather reports and city data, creating a local tunnel with ngrok, updating the webhook URL, and testing the IVR system. Throughout the tutorial, one learns how to establish routes, handle user input, generate dynamic responses, and merge Go and Twilio to construct a functional and interactive IVR application.