What is an RFID transponder?

An RFID transponder is a small electronic device that uses radio waves to transmit data wirelessly. It consists of a microchip and an antenna embedded together, usually in a card, label or small container. The microchip stores information that can be queried via radio waves by an RFID reader without the need for direct line of sight or physical contact. RFID transponders are used in many ways, for example for tracking goods, access control or in contactless payment systems.