EZ-Link is a contactless smart card used for public transportation in Singapore. It allows users to pay for bus and train fares conveniently without needing cash. The card can be topped up at various locations, including convenience stores and ticket machines. In addition to transportation, EZ-Link can also be used for payments at selected retail outlets and services. This versatility makes it a popular choice for both residents and tourists, streamlining daily transactions and enhancing the overall travel experience in the city.