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The QR, or "Quick Response" code, is much like barcode, except that it can hold more data. With one quick scan using a QR code reader app (most of which are free) the "matrix image," as Edutopia's Monica Burns calls it, can lead you to a specific place on the web.

The first time that I tried to scan a quick response (QR) code, I held my iPhone up to a poster on the subway. I was underground without any cell service, and I didn't know that there was such as thing as a QR code reader app.

It may look harmless enough, with its random pattern of tiny black squares on a white grid, but the next time you scan one of China's ubiquitous QR codes, you could end up seriously out of pocket....

Although QR codes have long since lost their shiny, new glow, the technology hasn't lost its value in education. The rise of one-to-one computing and bring-your-own-device programs in K-12 schools means students access digital learning tools more than ever before.

Design a QR Code 'Treasure Hunt' to get students using their mobile devices to move and to learn

Google Chrome for iOS has a new update that will enable users to scan QR codes and barcodes.

As mobile learning becomes more and more prevalent, we must find effective ways to leverage mobile tools in the classroom. As always, the tool must fit the need. Mobile learning can create both the tool and the need. With safe and specific structures, mobile learning tools can harness the excitement of technology with the purpose of effective instruction.