RFID technology uses radio waves to automatically identify objects. An RFID system consists of RFID tags attached to objects, RFID readers to interrogate tags, and an application system. There are three main types of tags: passive, semi-passive, and active. RFID is currently used in applications like credit cards, electronic toll collection, and access control. A survey found positive views of RFID's contactless reading, large data capacity, and ability to update tag data, though costs remain high and standards are still developing.