RFID cards are small, credit card-sized devices that use Radio Frequency Identification technology to transmit data wirelessly. They contain a tiny chip and an antenna, allowing them to communicate with a reader when in close proximity. This technology is commonly used for access control, payment systems, and inventory management. When an RFID card is scanned by a reader, it sends information stored on the chip, such as identification or payment details. This process is quick and efficient, making it a popular choice for businesses and organizations looking to streamline operations and enhance security.