Quick Response (QR) codes are two-dimensional barcodes that can be scanned by mobile phones to access digital content like websites or videos. QR codes allow physical print advertising to directly connect to online content. Businesses are using QR codes in outdoor advertising, magazines, business cards, and more to track customers and provide interactive digital experiences. While QR codes give businesses new ways to engage customers, some disadvantages include needing the proper scanning app and customers remembering to use their phones to access linked content.