The article describes how to build an on-demand translation service using Twilio MMS, CamFind, and Microsoft Translator. The service allows users to send a picture message with a language request, and the system will translate the image into the requested language. The system uses a Sinatra Ruby framework to handle incoming messages, interacts with the Twilio APIs, and makes REST API calls to the CamFind and Microsoft Translator APIs. The article provides a step-by-step guide on how to set up the project, including installing dependencies, creating the server code, and integrating the translation logic. Once deployed, users can send picture messages to the service's Twilio number to receive translated descriptions in their preferred language.