QR codes are two-dimensional barcodes that can be scanned by smartphone cameras to transfer information such as linking to websites or making phone calls. While QR codes were invented in 1994 in Japan, they became popular in the US around 2007-2008 with the rise of smartphones. The document provides best practices for using QR codes such as making them aesthetically pleasing, providing value to the user, and making them easy to scan in order to increase usage and engagement. It also discusses why QR codes often fail due to worthless content, low consumer awareness of how to scan them, and inappropriate placement.
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