Guide to using the London Oyster card on public transit. Using an Oyster card, a credit card sized transport card, is an easy way to save time and money if you are planning to use public transportation in London. An Oyster card can be used on just about every form of transport within London including public bus, tram, and rail services within the city. First we'll cover the main types of Oyster cards that are available, how to choose the best one, and how to buy an Oyster card. Then we'll talk about where you can use them, how to use them for travel, how to recharge the cards, registering your card, and note important travel exclusions for visitors. Finally we'll cover special issues such as how to get refunds, avoiding double payments, the alternative option of using contactless cards, the use of pink readers, and tips for those traveling with children. Our goal is help you decide if an Oyster card is a good fit for you and to help you effectively use your card on public transportation in London.