How do QR code generators work?

Related questions

1. How QR code are generated?
2. What can QR code be used for?
3. Why are QR codes important?
4. How big should QR codes be?
5. Is QR code open source?
6. What is the purpose of QR codes?

Tags

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2. #android
3. #which
4. #something
5. #quick
6. #means
7. #reader
8. #codes
9. #iphone
10. #addition
11. #smartphone
12. #business
13. #generated
14. #degrees
15. #direction
16. #customer
17. #scanned