The document discusses Microsoft's use of 2D barcodes called Tags to connect physical objects to digital content and marketing campaigns. It notes that Microsoft has printed over 2 billion Tags since 2009. Tags allow marketers to engage consumers through printed materials and reach them on mobile devices. The document promotes Tags as a way for marketers to measure campaign effectiveness through reporting on barcode scans. It provides several examples of Tags being used in magazines, product packaging, and other printed materials to drive engagement.