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"A QR code (or Quick Response code) is like a bar code, in that it can be scanned with a reader and it will present some information based upon what is held within the code. In the case of a bar code it is normally a number which corresponds with a product or ISBN number or similar. In the case of a QR code, different types of information can be held within them: URL (website address) Email address Phone number Text vCard SMS YouTube clip Facebook profile Wi-Fi details Twitter profile Map coordinate"