What are QR codes used for?

Related questions

1. Why QR code is better than barcode?
2. How a QR code is generated?
3. Are QR codes still relevant?
4. Are QR codes still relevant 2019?
5. Does anyone use QR codes anymore?
6. Are QR codes free to use?
7. Where is my QR code on my phone?
8. Is QR code safe?
9. Why do I need a QR code?
10. How do QR codes store information?

Tags

1. #nothing
2. #first
3. #barcode
4. #store
5. #other
6. #japan
7. #response
8. #readable
9. #stands
10. #barcodes
11. #dimensional
12. #information
13. #codes
14. #quick
15. #label
16. #developed
17. #square
18. #optical
19. #machine