Message Delivery Information` is a new tool introduced by Twilio, allowing developers to track the real-time delivery status of SMS and MMS messages. This feature provides critical data to improve delivery rates and reach a higher percentage of customers. With this tool, developers can see detailed explanations for failed or undelivered messages, including error codes that indicate reasons such as carrier guidelines violations or recipient unavailability. By using `Message Delivery Information`, companies like CarGurus and Uber have improved their SMS delivery rates, detecting issues with short code usage and failing over to long codes, ultimately increasing the reach of their messages to 98% of intended recipients.