You must've seen or heard about QR codes; a small graphic box with a "black and white" pattern that you can scan to quickly receive information. For example, you may have been to a restaurant to scan for a menu; or when you traveled your phone presented a QR code for boarding; or, if you scanned a QR code on a direct mailer you were able get additional information or contact the sender.
QR Codes: The Remedy for Real-Time TV Advertiser Engagement, Attribution and Instant TV Data
