Suica is a rechargeable smart card used for electronic payments and transportation in Japan. It was introduced by East Japan Railway Company (JR East) and is primarily used for train and bus fares in the Tokyo metropolitan area. The card can also be used at various shops, vending machines, and convenience stores. The Suica card operates on a contactless system, allowing users to simply tap the card on a reader to make payments. It can be easily recharged at ticket machines or convenience stores, making it a convenient option for both residents and tourists traveling in Japan.