Oyster Card
The Oyster Card is a rechargeable prepaid card of which there are two versions, the standard one, ideal if you stay more than two days or if you return often to London, and the one designed for visitors, the Visitor Oyster Card,
that you can buy even before arriving in the city. It costs 3
pounds and you can use it on the tube, bus, train, tram and DLR, as well as for rail service to / from Gatwick Airport.
The Visitor Oyster Card also includes various discounts to attractions and museums in the city. The price of each individual trip varies as indicated above by zones and times, but with the Oyster there is a daily limit of £ 6.60, regardless of how many trips you make.