A radio frequency identification (RFID) device is part of a system that uses radio waves to identify and track objects wirelessly, consisting of two main components: a RFID tag, which contains a chip and antenna to store data, and an RFID reader (or transceiver), which communicates with the tag by emitting radio waves and receiving the data back. RFID systems enable contactless, non-line-of-sight identification of multiple objects simultaneously, finding applications in inventory management, supply chain tracking, security, and healthcare.