What is QR Code and how does it work?

A QR Code (Quick Response Code) is a type of matrix barcode or two-dimensional barcode.QR codes often contain data for a locator, identifier, or tracker that points to a website or application. QR Codes are designed to be scanned using a camera, such as those found on your smartphone. QR Code scanning is built into many camera apps for Android and iOS. QR Codes are most often used to store web links; however, they can store arbitrary data, such as text or images.