QR code (abbreviated from Quick Response Code) is the trademark for a type of matrix barcode (or two-dimensional barcode) first designed for the automotive industry in Japan. A barcode is a machine-readable optical label that contains information about the item to which it is attached.
This first thing you are going to need to do here is go to the Google Play store and download the free QR Code Reader app – the file size should be around 3MB depending on your smartphone. ...
The only built-in iOS QR reader functionality is contained within the Wallet app on iPhone and iPod. To access the scanner, open the app, click on the plus button at the top of the "Passes" section, then tap on Scan Code to Add a Pass.