An Oyster card is a contactless smart card used for travel on public transport in London. It can be used on the Underground, buses, trams, DLR, London Overground, and most National Rail services within London. Oyster cards can be purchased at Underground and Overground stations, as well as at some newsagents and convenience stores.
Oyster cards offer a number of benefits over traditional paper tickets. They are more convenient, as they can be used to pay for travel without having to fumble for change. They are also more economical, as they offer a discount on the cost of travel compared to paper tickets. In addition, Oyster cards can be used to store travel passes, which can provide even greater savings.