The MetroCard is a smart card used for fare payment on the New York City Subway and MTA buses. It can be purchased at vending machines or ticket booths and is available in two types: pay-per-ride and unlimited ride options. The card can be reloaded with funds or time, making it convenient for regular commuters. To use the MetroCard, riders simply swipe it at the turnstile or tap it on the bus reader. The card deducts the fare automatically, allowing for quick and easy access to public transportation. It is an essential tool for navigating the city's extensive transit system.