What technology uses radio signals to communicate with a tag placed in or attached to an object an animal or a person?

The technology that uses radio signals to communicate with a tag placed in or attached to an object, animal, or person is called RFID (radio-frequency identification). RFID tags or chips are attached to objects, animals, or people, and RFID readers can send and receive signals from these tags using radio frequency (RF) technology. The RFID reader sends a signal to the tag, which responds with the stored data. This allows for identification, tracking, and data transfer between the tagged objects and the reader. RFID is commonly used in applications such as supply chain management, animal tracking, and electronic payment systems.