A "tap system" refers to a method of accessing and controlling resources, often used in various industries. It typically involves a user-friendly interface that allows individuals to "tap" on a screen or device to initiate actions, such as making payments or accessing information. This system enhances convenience and efficiency in daily tasks. In public transportation, for example, a tap system enables passengers to use a contactless card or mobile app to pay for their fare. This technology streamlines the boarding process and reduces the need for cash transactions, making travel more efficient for users of services like subway systems or buses.