How do QR codes store information?

Related questions

1. Where is my QR code on my phone?
2. How a QR code is generated?
3. Do QR codes expire?
4. Are QR codes still relevant?
5. What is QR code in Android?
6. Does anyone use QR codes anymore?
7. Why QR code is important?
8. How much information is in a QR code?
9. Can QR codes be encrypted?
10. How is information stored in a QR code?

Tags

1. #direction
2. #numeric
3. #amount
4. #vertical
5. #carried
6. #encoded
7. #characters
8. #store
9. #several
10. #barcode
11. #alphanumeric
12. #information
13. #times
14. #hundred
15. #horizontal
16. #carry