A QR code is a machine- readable code that consists of an array of black and white squares. To use it conveniently you must have a smart phone equipped with a camera and a QR code reader/scanner application feature. Some mobile casinos can be downloaded and installed by scanning such QR codes. Simply visit an online casino website that offers mobile play and open the QR app. Then steady your hand while the QR code is centered on the screen of your mobile device and that’s it. The mobile casino should present itself right away.