A QR code (abbreviated from Quick Response code) is a specific matrix barcode that is readable by dedicated QR barcode readers and camera telephones. The code consists of black modules arranged in a square pattern on a white background.
I can store a lot of information in my qr code box and it just takes you to scan the code box to get all the information.
I find this quite convenient and time effective. Try scanning my QR code to see what information comes up.