NEW YORK — Walgreens is making its Duane Reade street facings mobile-friendly with the addition of a QR-coded window cling across its storefronts, Mobile Marketer reported Tuesday. It's all part of ...

QR codes are a type of barcode, or scannable pattern, that contain various forms of data, like website links, account information, phone numbers, or even coupons. QR codes are found everywhere from ...