What is a QR Code?
Search in the App store or Google Play for a QR code scanner or use one of these:
QRafter-QR Code Reader iOS
QR & Barcode Scanner Google Play
Reflector App - Use Google Cast on Android and Airplay on iOS to mirror your device to a computer.
QR Stuff-Generate your own QR codes
Presentation Demos:
Apps to enhance photos
Phonto: Check iTunes and Google Play for app
Skitch: Check iTunes and Google Play for app
Photofunia: Check iTunes and Google Play for app
Padlet - download the app for iOS or Android