"Smart card" is based on IC cards technology as the core, to computer and communication technology as a means to the intelligent building within the various facilities to become an organic whole, the user through an IC card will be able to complete the usual keys, funds settlement, attendance and some control operations, such as using LC card to open the door, IC card dining, shopping, entertainment , meetings, parking, patrol, office, fee-based services and other activities. Instead of carrying a heavy key to open the door, to the corresponding departments, such as the payment of miscellaneous operations. The whole system can monitor and manage and make decisions according to the need of each department, and the local system and terminal can automatically collect and summarize the information collected for system query, summary, statistic, management and decision. Through IC card can communicate with each other, not only to meet the independence of each function management, but also to ensure the consistency of the overall management. From different occasions can be divided into: Campus smart card, Community smart card, office Building smart card, Enterprise smart card, hotel smart card, intelligent building smart card and so on. According to the card type can be divided into: IC card (the most widely used), ID card (phase-out), CPU card (development trend).