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RFID card
Radio Frequency IDentification
RFID card (Radio-Frequency Identification card) is a type of smart card that uses radio waves to communicate with a reader. It contains a tiny chip and antenna embedded inside, allowing it to transmit data wirelessly when it's near a compatible scanner.
Tecnical Characteristic
- Passive RFID cards: These don’t have a battery. They draw power from the reader’s signal and are commonly used for access control (like office badges or hotel key cards).
- Active RFID cards: These have their own power source and can transmit signals over longer distances, often used in logistics or tracking systems.
RFID cards are popular because they’re fast, contactless, and convenient. You’ve probably used one to tap into a metro station or unlock a building door. But they also raise privacy concerns—since they can be read without physical contact, some people use RFID-blocking wallets to prevent unauthorized scanning.