QR codes
QR is a Quick Response code. It is the trademark for a type of matrix barcode first designed in 1994 for the automotive industry in Japan. QR codes often contain data for a locator, identifier, or tracker that points to a website or application.
Software to scan QR codes

QR Reader for IOS
QR Reader for Android

I-nigma for IOS
I-nigma for Android

Barcode Scanner for Android