What is an Oyster card and how does it work?

Related questions

1. How do I get my Oyster card deposit back?
2. Are oysters alive when you eat them raw?
3. What are the odds of finding a pearl in an oyster?
4. What happens if I lose my Oyster card?
5. What does the metaphor the world is your oyster mean?
6. Is contactless same as oyster?
7. Is contactless cheaper than oyster?
8. What are London zones 1 6?
9. Is Contactless the same as oyster?
10. Can I buy an Oyster card in a shop?

Tags

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