QR codes are relatively new realm for marketers and there are many ways to use them. Here is some example of marketing function:
Make existing adverts work harder and faster
Newspaper, magazines and poster advertising containing a mobile link give consumer instant, anytime access to any/all sales and marketing information.
Show and tell more
Sales videos, TV commercials, Video, Music delivered direct to mobile from printed media – perfect for product launches and delivering integrated multi-media marketing campaigns.
Automatic build of history of individual advertisement medium responded by different promotion campaign
Printed Material is never out of Date