The EZ-Link card is a contactless smart card used for public transportation in Singapore. It allows users to pay for rides on buses and the MRT (Mass Rapid Transit) system conveniently. The card can be topped up with money at various locations, including ticket machines and convenience stores. In addition to transportation, the EZ-Link card can also be used for payments at selected retail outlets and services. It provides a quick and efficient way to travel around the city without needing cash or physical tickets, making it a popular choice among residents and tourists alike.