QR code, short for Quick Response code, is a machine-readable code comprising an array of black-and-white squares. It essentially works like barcodes. However, they are not the same as barcodes due to their physical characteristics. For example, barcodes can only be scanned in a line, whereas a scanner can read QR codes in all directions (two-dimensions). As a result, QR codes can hold more data than barcodes.