A QR Code (short for "Quick Response") is a two-dimensional code that can be scanned and read by most smartphones and most mobile phones which include a camera.
Mobile apps use the phone's camera to scan and read the codes.
QR Codes can be used to
* download a person's contact information to your phone
* add an event to a calendar
* display a video or URL
* send a text message, email, or make a phone call