QR-Codes are those square bar code type images that can be scanned with a smart phone.
Typically a store would put these QR-Codes on their in store product displays.
A customer can read the QR-Code and it will take them to a specific page on a website, usually with more information about a product which helps your customer make a buying decision.
A Practical QR Code Example
South Korea's Tesco wanted to leap frog ahead of their #1 competitor. Watch this video to find out how a better understanding of their customers' needs & QR Codes helped save the day!