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QR codes are a simply an image with encoded information. QR codes are similar to bar codes in the sense that they contain information that a specialized reader can extract. The big difference is that the QR reader is your mobile phone.

Here’s how it works. You take a picture of a QR code with your mobile phone and then you use a QR reader mobile app to retrieve the embedded information. This information can come in the form of URLs, plaintext, or phone numbers.

read more: The Next Big Thing in Mobile Marketing –  knowthenetwork