QR codes are 2D barcodes often scanned with a cell phone. Ae QR code is captured by the mobile phone's camera and decoded with software in the phone. The phone software can then act on the data in the QR code. One example is putting a URL in a QR code. Scan it with your phone and your phone's browser goes to that web page.

QR codes can be used in all sorts of creative ways. Create your own QR barcode with this free online generator.

Imagine a movie opening and leaflets all over town have QR codes in them. Snap a picture of one with your phone and the movie's preview clip is pushed to your phone. Scan a QR barcode on your concert ticket and download a free ringtone as you leave the show. Scan the sign in a subway station as you get off the train and your phone gets the map of the neighborhood you're stepping into.

QR barcodes make delivering microfocused, location specific information a snap on smart phones. Ads and graffiti can trigger phone content. Cell phones become kiosks that update as you travel. Tourists rejoice. Geocachers play. Mashups galore!.