QRCODES (quick response codes) are a type of matrix barcode.
This diagrem shows all of the different components of a QR code
What types of data can they hold?
Where are they used?
They were initially used to track parts in vehicle manufacturing. They are now used much more widely in commercial tracking, entertainment and loyalty marketing to name a few. QR codes can be found on many advertisements so that when you scan one... you are taken to a pictre, link or video that will give you more information about that product.
How do you use them? -> software... hardware.
Different standards?
http://en.wikipedia.org/wiki/QR_code
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