How does QR code work?

Related questions

1. Can QR codes have viruses?
2. Are QR codes safe to use?
3. Which is better QR code or barcode?
4. Can QR codes be reused?
5. Can QR codes expire?
6. What do QR codes tell you?
7. What's the point of QR codes?
8. How are QR codes used?
9. Are QR codes coming back?
10. Can you get a virus from a QR code?

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5. #smartphone
6. #basically
7. #image
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14. #black
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16. #number
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18. #machine
19. #supermarket
20. #squares
21. #barcode