QR Codes are the same way. They can give you access to an infinite or finite amount of information, depending on how you use it. Students can take advantage of this when completing assignments. A few strategically placed QR Codes in a paper can give the reader an opportunity to access additional information (videos, images, blog entries, articles, and more) that simply cannot fit inside of paper with a limit on the number of pages of words.
A presentation with QR Codes attached to them give audience members the option of watching a cell replicate while the presenter is explaining it. Or, it someone would like additional images of a historical event while you're telling the story, a QR Code can easily guide them to the best places.
Students involved in extra-curricular activities can add QR Codes to posters so that anyone walking by that wants to save information or a web site being advertised can scan the code and save it to their phone for later viewing.
No matter the application, QR Codes can share as much or as little information as the presenter needs.
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