What is Oyster card in London?

Related questions

1. Does London Oyster card expire?
2. What are the zones in London?
3. What is a TfL travel charge?
4. Is Walton on Thames in Oyster zone?
5. How do I get my oyster deposit back?
6. What zones are covered by a Travelcard?
7. Can I use my Oyster on South Western Railway?
8. Can I use Oyster card on national rail?
9. How much is Oyster card deposit?
10. Can I use Oyster on TfL rail?

Tags

1. #cards
2. #arrive
3. #ticket
4. #stations
5. #shops
6. #visitor
7. #before
8. #public
9. #transport
10. #electronic
11. #oyster
12. #london
13. #online
14. #smartcards
15. #centres