How do Oyster cards work?

Related questions

1. How do you put money on an Oyster card?
2. Does each person need their own Oyster card?
3. How much is a replacement Oyster card?
4. Does an Oyster card expire?
5. How can I check the balance on my Oyster card?
6. Can you redeem Oyster cards?
7. Can I refill my Oyster card online?
8. Does a Visitor Oyster card expire?
9. Can I buy an Oyster card online?
10. Is there a daily cap on Oyster cards?

Tags

1. #contactless
2. #touch
3. #yellow
4. #public
5. #visitor
6. #travel
7. #cheapest
8. #enter
9. #smartcards
10. #journey
11. #transport
12. #payment
13. #reader
14. #oyster
15. #gates
16. #london
17. #electronic
18. #cards