The Intelligent Mail® barcode is a technology platform designed to enhance postal services by providing end-to-end visibility through a combination of new barcodes and electronic documentation. It allows for automation discounts, tracking capabilities, and supports two service levels: basic and full-service, each with specific requirements for barcode usage. The document also details the transition from the Postnet barcode to the Intelligent Mail barcode and the benefits of various associated services like address correction and tracking.