A Suica card is a reload able smart card used as a fare card on rail lines in Japan. To purchase a new Suica, you will need ¥2000 (¥1,500 prepaid, ¥500 deposit). When you no longer need your Suica card, you can return at a JR East station or subway office.
The benefit to having this prepaid travel card is convenience. As a foreigner you may not want to carry around tons of loose change in your pocket or slow down the line counting yen at rail station restaurants. In the video above Yuta and Mihoko from Tokyo Daily Life will show you how to purchase a Suica card and some of its additional uses.