This document introduces QR codes and discusses their potential uses in teaching and learning. It defines a QR code as a type of matrix barcode that can encode various data like web links, phone numbers, or text. The document then discusses how QR codes can be generated and read, and provides examples of how they could be used to improve feedback loops and integrate with library catalogs. It also shares the results of a student survey that found only a small percentage are currently aware of or have used a QR code.