The technology that uses electromagnetic fields to identify objects is radio frequency identification (RFID). RFID technology employs electromagnetic waves to transmit data between a reader and a tag attached to the object, facilitating tracking and identification. This technology is widely used in various industries, including retail for inventory management, logistics for tracking shipments, and access control systems for secure entry. Through its ability to operate without direct line-of-sight and to read multiple tags simultaneously, RFID enhances efficiency and accuracy in identifying and managing assets.