An RFID card, which stands for Radio-Frequency Identification card, is a handy tool that uses radio waves to transmit data wirelessly. Imagine a credit card with a tiny computer chip inside. That chip stores information that can be read by a special scanner using radio waves, without needing to swipe or insert the card. Here's a breakdown of how it works: The card itself: It contains a microchip and an antenna. The chip stores the data, and the antenna transmits it wirelessly when it comes close to an RFID reader. The reader: This device emits radio waves and reads the data transmitted by the card's antenna. Depending on the system, the reader might also send power to the card to activate it. RFID cards are used in many different applications, such as: Security access control: Granting entry to buildings, secure areas, or events. Payment systems: Contactless payments, like tapping your credit card to pay. Identification badges: Employee badges, stude