RFID (Radio-Frequency Identification) transponders, also known as RFID tags, are small electronic devices that consist of an integrated circuit (IC) or chip attached to an antenna. These tags are used for identifying and tracking objects remotely using radio waves. RFID tags come in various forms, including passive, active, and semi-passive tags. Passive tags rely on power supplied by the RFID reader's electromagnetic field, while active tags have their own power source, typically a battery. Semi-passive tags use a battery to power the chip but rely on the reader's field to transmit data. RFID tags find applications in inventory management, asset tracking, supply chain management, access control, and contactless payment systems.