Everywhere you look at the South by Southwest conference this week, you see QR codes. The square “quick response” codes turn URLs, vCards, or any kind of text into a jumble of pixels that you can scan ...

Crate and Barrel has joined other leading retailers, such as Macy’s, Target and Wal-Mart, in deploying a marketing campaign featuring quick response (QR) codes. With QR codes, shoppers can instantly ...