As smartphones have become more and more ubiquitous, so have QR codes. These maze-looking squares are a type of matrix bar code that contains data — usually, QR codes point to a website or open ...

You might have come across QR ... Data Matrix, UPC and QR codes. QR Pal (Free): This app will save all the codes and sort them as per the type. It has a great interface that is quite easy to use.