Smart card systems are secure, portable devices that store and process data. They typically contain a microprocessor or memory chip, allowing them to perform various functions, such as storing personal information, making payments, or accessing secure locations. Smart cards can be contact-based, requiring a physical connection to a reader, or contactless, using radio frequency identification (RFID) technology for quick transactions. These systems are widely used in various industries, including finance, healthcare, and transportation. For example, many credit cards and identification cards utilize smart card technology to enhance security and streamline user experiences. Additionally, smart cards can support multiple applications, making them versatile tools for everyday use.